Drunken lad tore stretchy costume (7)
I believe the answer is:
leotard
'stretchy costume' is the definition.
'leotard' can be an answer for 'costume' (costume worn by a dancer). I'm not certain of the 'stretchy' bit.
'drunken lad tore' is the wordplay.
'drunken' is an anagram indicator.
'lad'+'tore'='ladtore'
'ladtore' with letters rearranged gives 'LEOTARD'.
Can you help me to learn more?
(Other definitions for leotard that I've seen before include "Dancers might wear this" , "Stretchy one-piece garment" , "Tight-fitting garment, for gymnasts say" , "Gymnast's tight costume" , "Close-fitting garment worn by dancers" .)