Ring through at one point for work (7)
I believe the answer is:
operate
'for work' is the definition.
(synonyms)
'ring through at one point' is the wordplay.
'ring' becomes 'O' (letter resembling a ring).
'through' becomes 'per' ('per' can mean through or by means of).
'one point' becomes 'e' (compass point).
'o'+'per'+'at'+'e'='OPERATE'
(Other definitions for operate that I've seen before include "Work, function" , "Function; run" , "Carry out surgery" , "Control, run, a machine say" , "Work - perform surgery" .)