Male in lather replaced such underwear? (7)
I believe the answer is:
thermal
'underwear?' is the definition.
(I've seen this before)
'male in lather replaced' is the wordplay.
'male' becomes 'm' (common abbreviation).
'in' means one lot of letters goes inside another.
'replaced' is an anagram indicator.
'lather' is an anagram of 'theral'.
'm' put inside 'theral' is 'THERMAL'.
'such' acts as a link.
(Other definitions for thermal that I've seen before include "Up-current of air" , "Designed to retain heat" , "Warm or hot - underwear?" , "Warm like winter woollies" , "Column of rising air used by gliders" .)