Wrap pinky up in fat dancewear (7)
I believe the answer is:
leotard
'dancewear' is the definition.
(I know that leotard is a type of dancewear)
'wrap pinky up in fat' is the wordplay.
'wrap pinky' becomes 'toe' (I can't justify this - if you can you should believe this answer much more).
'up' is a reversal indicator (in down clue: letters go upwards).
'in' indicates putting letters inside.
'fat' becomes 'lard' (lard is a kind of fat).
'toe' written backwards gives 'eot'.
'eot' placed within 'lard' is 'LEOTARD'.
Can you help me to learn more?
(Other definitions for leotard that I've seen before include "Dancer's tight-fitting garment" , "Stretchy one-piece garment" , "Tight-fitting garment, for gymnasts say" , "Dancers might wear this" , "Garment used eg in ballet or yoga" .)