Agent is bitter about shows (10)

I believe the answer is:

represents

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'shows' is the definition.
(I've seen this before)

'agent is bitter' is the wordplay.
'agent' becomes 'rep' (short for representative).
'is bitter' becomes 'resents' (I can't explain this - if you can you should give a lot more credence to this answer).
'rep'+'resents'='REPRESENTS'

'about' acts as a link.

Can you help me to learn more?

(Other definitions for represents that I've seen before include "Portrays" , "Stands for" , "shows" , "plays" .)

I've seen this clue in The Everyman puzzle in The Observer.

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