Possibly deliver Galloway's somewhat political vengeance (5)

I believe the answer is:

calve

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'possibly deliver galloway's' is the definition.
I can't tell whether this defines the answer.

'somewhat political vengeance' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'CALVE' is hidden in the letters of 'political vengeance'.

Can you help me to learn more?

(Other definitions for calve that I've seen before include "Drop New Jersey, perhaps" , "left in grotto" , "Bring forth a baby cow!" , "Split from the pack" , "Give birth (of whales or cows)" .)

I've seen this clue in The Independent.

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