Crossword Genius

Little girl's hat (5)

Ross

I believe the answer is:

tammy

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

'little girl's' is the definition.
'Tammy' can be an answer for 'girl's'. I'm unsure of the 'little' bit.

'hat' is the wordplay.
I cannot quite understand how this works, but
'hat' could be 'tam' and 'tam' is found within the answer.
The remaining letters 'my' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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