Slaughter in service area? (8)
I believe the answer is:
massacre
'slaughter' is the definition.
(I know that slaughter can be written as massacre)
'service area?' is the wordplay.
'service' becomes 'mass' (church service).
'area?' becomes 'acre' (an acre is an area of land).
'mass'+'acre'='MASSACRE'
'in' is the link.
(Other definitions for massacre that I've seen before include "Slaughter, pogrom" , "Indiscriminate killing of large numbers" , "Destroy" , "Overwhelming defeat" , "Yours and mine" .)