Host right into skimpy beachwear (6)
I believe the answer is:
throng
'host' is the definition.
(both can mean a large group of people)
'right into skimpy beachwear' is the wordplay.
'right' becomes 'r' (abbreviation).
'into' means one lot of letters goes inside another.
'skimpy beachwear' becomes 'thong' (I've seen this in another clue).
'r' placed within 'thong' is 'THRONG'.
(Other definitions for throng that I've seen before include "Large crowd or host" , "A great crowd of people" , "Large packed crowd" , "Multitude" , "Mob" .)