She’s a backer, too (4)

I believe the answer is:

anna

I'm a little stuck... Click here to teach me more about this clue!

'backer too' is the definition.
I can't judge whether this defines the answer.

'she's a' is the wordplay.
'she' becomes 'ann' (I've seen this before**).
'ann'+'a'='ANNA'

Can you help me to learn more?

(Other definitions for anna that I've seen before include "Girl's name (palindrome)" , "Old foreign coin" , "Unit of length" , "Former Indian coin; girl's name" , "- - Ford (TV)" .)

I've seen this clue in the Evening Standard.

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