Do form a political group! (5)

I believe the answer is:

party

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'do form' is the first definition.
'party' can be an answer for 'do' (I've seen this before). I am not sure about the 'form' bit.

'a political group' is the second definition.
(a political party)

Can you help me to learn more?

(Other definitions for party that I've seen before include "Bash" , "Social function" , "Social gathering; person" , "Political group - celebration" , "push the boat out" .)

I've seen this clue in the Sydney Morning Herald.

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