To a hothead, is she a plaything? (5)

'to' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'a hothead is she a plaything?' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
'hothead' could be 'h' (head letter of 'hot') and 'h' is found in the answer.
'plaything?' could be 'toy' ('toy' can be a synonym of 'plaything') and 'toy' is present in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?