Area covered by recasting of Hot Lips in MASH? (8)
I believe the answer is:
hospital
'mash?' is the definition.
(MASH is short for mobile army surgical hospital)
'area covered by recasting of hot lips' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'covered by' indicates putting letters inside.
'recasting of' is an anagram indicator (letters cast around).
'hot'+'lips'='hotlips'
'hotlips' with letters rearranged gives 'hospitl'.
'a' going inside 'hospitl' is 'HOSPITAL'.
'in' acts as a link.
(Other definitions for hospital that I've seen before include "Possibly Guy's" , "Sanatorium" , "Treatment and care centre" , "asylum?" , "Medical institution" .)