Host runs out in revealing swimsuit (5)
I believe the answer is:
thong
'revealing swimsuit' is the definition.
(I've seen this in another clue)
'host runs out' is the wordplay.
'host' becomes 'throng' (both can mean a large group of people).
'runs' becomes 'r' (cricket abbreviation).
'out' suggests deleting specific letters.
'throng' with 'r' removed is 'THONG'.
'in' acts as a link.
(Other definitions for thong that I've seen before include "Leather strip fastener" , "Strip of leather - minimalist beachwear" , "Frequently (archaic)" , "Embarrassingly brief underwear" , "Skimpy garment" .)