Underwear that is put on last (8)
I believe the answer is:
lingerie
'underwear' is the definition.
(type of underwear)
'that is put on last' is the wordplay.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'put on' says to put letters next to each other.
'last' becomes 'linger' (both can mean to remain).
'ie' put after 'linger' is 'LINGERIE'.
(Other definitions for lingerie that I've seen before include "flimsy stuff" , "Women's flimsy underwear" , "Fancy underwear for women" , "Women's underwear and nightwear" , "Women's underclothes" .)