Surrey town some reps omitted (5)
I believe the answer is:
epsom
'surrey town' is the definition.
(I've seen this before)
'some reps omitted' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'EPSOM' can be found hidden inside 'reps omitted'.
(Other definitions for epsom that I've seen before include "Derby area" , "Classic racecourse" , "Home to the Derby and the Oaks" , "Town with racecourse" , "Mares would triumph here" .)