What you might pay for side dishes (5)

I believe the answer is:

extra

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'side dishes' is the definition.
'extra' can be an answer for 'side' (thesaurus). I'm not sure about the 'dishes' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for extra that I've seen before include "Minor player in film" , "lesser player" , "fortuitous run" , "comes to 16 [TEST MATCH]" , "Exceptionally" .)

I've seen this clue in The Irish Times.

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