A girl has a metal one (4)

I believe the answer is:

tina

'a girl' is the definition.

'a metal one' is the wordplay.
'a metal' becomes 'tin' (tin is a kind of metal**).
'one' becomes 'a'.
'tin'+'a'='TINA'

'has' is the link.

(Another definition for tina that I've seen is " Ain't this a girl?".)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app