Small cars go for service (8)
I believe the answer is:
ministry
'service' is the definition.
(thesaurus)
'small cars go' is the wordplay.
'small cars' becomes 'minis' (I've seen this before).
'go' becomes 'try' (I've seen this before).
'minis'+'try'='MINISTRY'
'for' is the link.
(Other definitions for ministry that I've seen before include "members of the clergy" , "Government building" , "church" , "Priests' work" , "Government department" .)