Popular — attractive (3)
I believe the answer is:
hot
This clue is a double definition.
'popular' is the first definition.
(hot can mean popular or trendy)
'attractive' is the second definition.
(I've seen this in another clue)
(Other definitions for hot that I've seen before include "SECOND PART OF 11" , "Flaming - stolen" , "Flaming - spicy" , "(Of goods) stolen (colloq.)" , "Spicy or very warm" .)