Politicians given the wrong part in plays (5)

I believe the answer is:

romps

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'plays' is the definition.
(I know this)

'politicians given the wrong part' is the wordplay.
'politicians' becomes 'MPs' (Members of Parliament).
'given' is a charade indicator (letters next to each other).
'the wrong part' becomes 'ro' (I can't justify this - if you can you should believe this answer much more).
'mps' after 'ro' is 'ROMPS'.

'in' acts as a link.

Can you help me to learn more?

(Another definition for romps that I've seen is " Frolics".)

I've seen this clue in the Evening Standard.

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