Gather for voting -- with it gaining external victory (4,2)

I believe the answer is:

whip in

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'gather' is the definition.
(thesaurus)

'voting with it gaining external victory' is the wordplay.
I cannot really understand how this works, but
'with' could be 'w' (abbreviation) and 'w' is found in the answer.
'victory' could be 'pin' (pin is a kind of victory) and 'pin' is found within the answer.
The remaining letters 'hi' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'for' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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