What does the cryptic crossword clue "A bit screwed back, now enabled again (4)" mean?

The definition is "again". The wordplay uses hidden reversed. Hidden reversed in "a bit screwed back, noW ENAbled again" The answer is ANEW.

A bit screwed back, now enabled again (4)

Guardian Cryptic #29421 | 21 Across | 2024-06-28 flower