Finished refrain in swamp (10)

I believe the answer is:

overburden

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'swamp' is the definition.
(thesaurus)

'finished refrain' is the wordplay.
'finished' becomes 'over' (over can mean finished or ended).
'refrain' becomes 'burden' (I can't explain this - if you can you should give a lot more credence to this answer).
'over'+'burden'='OVERBURDEN'

'in' is the link.

Can you help me to learn more?

(Other definitions for overburden that I've seen before include "demand too much work" , "Worry too much" , "Load excessively" .)

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