Part of parliamentary address, according to someone whipping (6)

I believe the answer is:

swiper

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'part of parliamentary address' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'according to someone whipping' is the wordplay.
'according' becomes 'per' (I've seen this in other clues).
'to' says to put letters next to each other (I've seen this in other clues).
'someone whipping' becomes 'swi' (I can't justify this - if you can you should give a lot more credence to this answer).
'per' put after 'swi' is 'SWIPER'.

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I've seen this clue in The Times.

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