Slaughter in the service area (8)
I believe the answer is:
massacre
'slaughter' is the definition.
('massacre' can be a synonym of 'slaughter')
'the service area' is the wordplay.
'the service' becomes 'mass' (I've seen this before).
'area' becomes 'acre' (I've seen this before).
'mass'+'acre'='MASSACRE'
'in' acts as a link.
(Other definitions for massacre that I've seen before include "Wholesale slaughter" , "Destroy" , "bloody victory" , "Inflict a heavy defeat" , "Indiscriminate killing of large numbers" .)