Crossword Genius

It's a help when you get her back (5)

Ross

I believe the answer is:

diana

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

'back' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'it's a help when you get her' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
'her' could be 'di' and 'di' is present in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for diana that I've seen before include "British princess" , ""The People's Princess"" , "female" , "Roman goodess of hunting or tragic English princess" , "Roman huntress goddess" .)

I've seen this clue in the Evening Standard.
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