Nether garment (8)
I believe the answer is:
trousers
'nether garment' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for trousers that I've seen before include "Leg coverings" , "Nether garment" , "One may be caught with them down" , "Longs" , "Garments fro the nether regions" .)