Crossword Genius

Funding for campaign work is cancelled, which is extremely sly (7)

Ross

I believe the answer is:

archest

'is extremely sly' is the definition.

'funding for campaign work is cancelled' is the wordplay.
'funding for campaign' becomes 'warchest'.
'work' becomes 'w' (physics abbreviation).
'is cancelled' suggests deleting specific letters.
'warchest' with 'w' removed is 'ARCHEST'.

'which' is the link.

I've seen this clue in The Independent.
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