Duet for One by Bandmaster

Puzzle explanation

Solvers were to construct a secondary grid as shown, with black squares where the original grid contained letters N to Z and the rest filled using the supplied plain definitions. The diagonals of the secondary grid read “Buy one, get one free” and its acronym, BOGOF, was to be highlighted in the diagonal of the original grid.

Clue explanations

Conventions: * = anagram, < = reversal

Extra word (answer in secondary grid) Answer Explanation
Across
reform BLACK BACK around L
diagram ACES CE in AS
Clearing LAKE LEAK *
cells LOFTER (tai)L OF TER(errier)
containing ASTIR ASTI + R
atom [A to M] EGGHEAD EG + HE in GAD
simultaneously BABY BY after BA
darkening UNEVEN EN after VENU(s) <
remainder DEAL LEAD with its ends exchanged
resolve [re-solve] FRECKLIER RECK in FLIER
using ENTASIS (SEA ISN’T) *
these ERGO (dapp)ER GO(rgeous)
definitions CLASHED C(hambers) + LASH + ED
Deceiving (BLUFFING) OLPE (p)EOPL(e) *
Opening (PORE) REVERSI (IS + EVER) < around (yea)R
Bolts (THUNDERSTORM) PLACE CARD PLACARD around CE
king (HENRY) ALGA GALA *
Discrimination (AGEISM) SERINS S + ERIN + ’S
friends (ALLIES) UDAL ADUL(t) *
followed (OBEYED) DECIMAL MEDICAL *
Shooter (GUNNER) PISTE IS in PTE
outsized (OBESE) NERITE NEE around RIT
braced (STRENGTHENED) HA-HA (H + A) + (H + A)
network (GRID) SHED SH + ED
glittering (STARLIKE) DICED (D + D) around ICE
Down
group (BATCH) BLEEDS B(irmingham) + LEEDS
reversal (U-TURN) LOG-REEL (LEG ROLE) *
commando (FEDAYEE) AFGHANI (ASIAN FIGHT) * − IT’S *
French (NORMAN) KEEL 2 meanings
outline (PROFILE) ARAR A + RAR(e)
recalls (REMEMBERS) ESAU (Mose)S in EAU
Lauder (EULOGISER) STINKWEED (IN TWEEDS) * around K
Disregarded (IGNORED) LIBELED LIED around BEL
Monk (BROTHER) À RAVIR (R(eveals) + AV) in AIR
Smart (BRIGHT) KIBE BIKE *
boredom (ENNUI) SYNROC (CORNY + S(adly)) <
Don (ENDUE) HOLT L in HOT
find DEISEAL (E + LADIES) *
slant FALSENESS (LENSES + SAF(e)) *
Wise HOPS UP H + OPS + UP
expression CECILIA EC in CILIA
submit ISLAMIC (I CLAIMS) *
original MIGRATE MIG + RATE
barred PARAPH HARP * after PA
Numberless RANI (I)RANI(an)
grid SAILED LADIES *
highlighting EDDA ADDE(r) <
five SITH IT’S * + H
aligned ZEND ZEN + ’D
letters ICED (Goth)IC ED(ition)
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