Collects service points after ace (7)
I believe the answer is:
amasses
'collects' is the definition.
('amass' can be a synonym of 'collect')
'service points after ace' is the wordplay.
'service' becomes 'mass' (I've seen this in other clues**).
'points' becomes 'es' (E is an example).
'after' means one lot of letters go next to another.
'ace' becomes 'a'.
'mass'+'es'='masses'
'masses' put after 'a' is 'AMASSES'.
(Other definitions for amasses that I've seen before include "Collects" , "'Accumulates, gathers (7)'" , "Gathers together" .)