Romeo wearing skimpy garment in crowd (6)
I believe the answer is:
throng
'crowd' is the definition.
(I know that throng is a more specific form of the action crowd)
'romeo wearing skimpy garment' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'wearing' is an insertion indicator.
'skimpy garment' becomes 'thong' (type of undergarment).
'r' inserted inside 'thong' is 'THRONG'.
'in' acts as a link.
(Other definitions for throng that I've seen before include "A great crowd of people" , "A large crowd of people" , "Large crowd or host" , "Troop" , "A crowded mass of people" .)