Caught French friend alone getting undergarment (8)
I believe the answer is:
camisole
'undergarment' is the definition.
(I know that camisole is a type of undergarment)
'caught french friend alone getting' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'french friend' becomes 'ami' (I've seen this before).
'alone' becomes 'sole' (synonyms).
'getting' is a charade indicator (letters next to each other).
'c'+'ami'+'sole'='CAMISOLE'
(Other definitions for camisole that I've seen before include "Item of lingerie" , "Woman's undergarment with shoulder straps" , "Short undergarment for women" , "woman could wear it" , "Short sleeveless undergarment" .)