Hiding, maybe, in service area (8)
I believe the answer is:
massacre
'hiding maybe' is the definition.
(both can mean a violent attack)
'service area' is the wordplay.
'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 "Wanton slaughter" , "Slaughter of large number of people" , "Heavily defeat" , "Murder (of many persons)" , "Butchery" .)