One fit to help with identification? (5)

I believe the answer is:

photo

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

'help with identification?' is the definition.
I can't judge whether this definition defines the answer.

'one fit to' is the wordplay.
'one fit' becomes 'pho' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pho'+'to'='PHOTO'

Can you help me to learn more?

(Other definitions for photo that I've seen before include "Snap, picture" , "Picture (abbr)" , "This race finish is very close" , "In brief, a snapshot" , "Still" .)

I've seen this clue in the Evening Standard.

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