Attractive policeman dresses in loincloth (5)
I believe the answer is:
dhoti
'loincloth' is the definition.
(dhoti is a kind of loincloth)
'attractive policeman dresses' is the wordplay.
'attractive' becomes 'hot' (I've seen this in another clue).
'policeman' becomes 'di' (abbreviation for Detective Inspector).
'dresses' indicates putting letters inside (dress can mean cover).
'hot' going inside 'di' is 'DHOTI'.
'in' acts as a link.
(Other definitions for dhoti that I've seen before include "Lean over; end of loaf" , "pants in Goa?" , "Indian loincloth" , "Loin cloth" , "garment in India" .)