In time, working brings rewards (7)
I believe the answer is:
honours
'rewards' is the definition.
('honour' can be a synonym of 'reward')
'in time working' is the wordplay.
'in' indicates putting letters inside.
'time' becomes 'hours' (I can't justify this - if you can you should believe this answer much more).
'working' becomes 'on' (e.g. a machine is working or on).
'hours' placed around 'on' is 'HONOURS'.
'brings' acts as a link.
Can you help me to learn more?
(Other definitions for honours that I've seen before include "Respects" , "Type of university degree" , "Jack's contribution to these" .)