What does the cryptic crossword clue "Conclude New York is full? Like hell (10)" mean?

The wordplay uses a charade (building blocks). INFER (synonym="‘conclude’") + NALLY (synonym="NALLY") = INFERNALLY The answer is INFERNALLY.

Conclude New York is full? Like hell (10)

Guardian Cryptic #29378 | 4 Down | 2024-05-09 flower