Attractive girl embracing Charlie (6)
I believe the answer is:
catchy
'attractive' is the definition.
('catchy' can be similar in meaning to 'attractive')
'girl embracing charlie' is the wordplay.
'girl' becomes 'cathy' (**).
'embracing' means one lot of letters goes inside another.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'cathy' placed around 'c' is 'CATCHY'.
(Other definitions for catchy that I've seen before include "Of a tune, lively and easy to remember" , "Of tune, pleasant and easily remembered" , "Staying in the mind of a tune" , "like certain tunes?" , "what's full of snags, perhaps" .)