Girl, nervous but attractive (5)
I believe the answer is:
dishy
'attractive' is the definition.
('dishy' can be similar in meaning to 'attractive')
'girl nervous' is the wordplay.
'girl' becomes 'di' (**).
'nervous' becomes 'shy' (I've seen this in other clues).
'di'+'shy'='DISHY'
'but' is the link.
(Other definitions for dishy that I've seen before include "Handsome" , "Informally good-looking, like plate?" , "Good-looking (informal)" , "Good-looking (colloq.)" , "Fair" .)