She's crazy for gain! (4)

I believe the answer is:

gina

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'she's' is the definition.

'crazy for gain' is the wordplay.
'gain' can be anagrammed to 'GINA'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for gina that I've seen before include "- - Lollobrigida (films)" , "Girl's name" , "- Lollobrigida, Italian twentieth century film actress" .)

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