I'm so aroused in fancy lace underwear (8)
I believe the answer is:
camisole
'underwear' is the definition.
(I know that camisole is a type of underwear)
'i'm so aroused in fancy lace' is the wordplay.
'aroused' is an anagram indicator (letters roused or stirred up into a new form).
'in' means one lot of letters goes inside another.
'fancy' is an anagram indicator.
'im'+'so'='imso'
'imso' anagrammed gives 'miso'.
'lace' with letters rearranged gives 'cale'.
'miso' placed within 'cale' is 'CAMISOLE'.
(Other definitions for camisole that I've seen before include "Slip" , "Female undergarment" , "Underbodice with shoulder straps" , "Top" , "Close aim (anag.)" .)