What does the cryptic crossword clue "Godzilla’s sister bites back (6)" mean?

The definition is "back". The wordplay uses a hidden word. Hidden in "godzillA’S SISTer bites back" The answer is ASSIST.

Godzilla’s sister bites back (6)

Guardian Cryptic #29336 | 19 Down | 2024-03-21 flower