In bed, chaps love spice (7)
I believe the answer is:
pimento
'spice' is the definition.
(thesaurus)
'in bed chaps love' is the wordplay.
'in' means one lot of letters goes inside another.
'bed' becomes 'pit' (I've seen this in other clues).
'chaps' becomes 'men' (chap means a man).
'love' becomes 'o' (love means zero in tennis).
'pit' enclosing 'men' is 'piment'.
'piment'+'o'='PIMENTO'
(Other definitions for pimento that I've seen before include "Jamaica pepper" , "Type of pepper" , "Sweet red pepper" , "Something spicy" , "Vegetable" .)