What does the cryptic crossword clue "DJ is one equalizing deck (7,5)" mean?

The wordplay uses a charade (building blocks). EVENING (synonym="equalising") + DRESS (synonym="deck") = EVENINGDRESS The answer is EVENINGDRESS.

DJ is one equalizing deck (7,5)

Guardian Cryptic #29444 | 10 Down | 2024-07-25 flower