After a job's finished, the burden of payment? (5)
I believe the answer is:
bonus
'payment?' is the definition.
(bonus is a kind of payment)
'after a job's finished the burden' is the wordplay.
'after' means one lot of letters go next to another.
'a job's finished' becomes 'b' (I can't explain this - if you can you should believe this answer much more).
'the burden' becomes 'onus' ('onus' can be a synonym of 'burden').
'b' next to 'onus' is 'BONUS'.
'of' is the link.
Can you help me to learn more?
(Other definitions for bonus that I've seen before include "Extra money paid for good performance" , "Good performance reward" , "Payment additional to the expected or usual" , "Good-performance payment" , "Extra pay, perhaps at Christmas?" .)