Salvation Army service includes a good term of endearment (7)
I believe the answer is:
sausage
'term of endearment' is the definition.
(sausage is a term of endearment)
'salvation army service includes a good' is the wordplay.
'salvation army' becomes 'SA' (abbreviation).
'service' becomes 'use' (I've seen this in another clue).
'includes' is an insertion indicator.
'good' becomes 'g' (abbreviation).
'a'+'g'='ag'
'use' enclosing 'ag' is 'usage'.
'sa'+'usage'='SAUSAGE'
(Other definitions for sausage that I've seen before include "Seasoned minced meat stuffed in casing" , "BBQ food?" , "Item butcher sells" , "Eg, salami or cervelat" , "Minced meat product" .)