Photographed topless — really attractive (3)
I believe the answer is:
hot
'really attractive' is the definition.
(hot can informally mean attractive or good-looking)
'photographed topless' is the wordplay.
'photographed' becomes 'shot' ('shoot' can be a synonym of 'photograph').
'topless' means to remove the first letter.
'shot' with its initial letter removed is 'HOT'.
(Other definitions for hot that I've seen before include "SECOND PART OF 11" , "Stolen - sought after" , "Sultry or angry" , "(Of goods) stolen (colloq.)" , "Flaming - spicy" .)