Manufacturer of timepieces with new start becomes go-between for couples (10)
I believe the answer is:
matchmaker
'go-between for couples' is the definition.
(someone who sets couples up)
'manufacturer of timepieces with new start' is the wordplay.
I cannot quite understand how this works, but
'manufacturer' could be 'maker' (synonyms) and 'maker' is present in the answer.
The remaining letters 'match' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'becomes' acts as a link.
(Other definitions for matchmaker that I've seen before include "One who arranges marriages for others" , "Cupid" , "worker responsible for strikers leaving the factory?" , "One brings together" , "One seeking to bring couples together" .)