A rising of workers (7)

I believe the answer is:

anthill

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'of workers' is the definition.
The definition suggests a singular noun which matches the answer.

'a rising' is the wordplay.
'a' becomes 'an'.
'rising' becomes 'thill' (I am not sure about this - if you are sure you should believe this answer much more).
'an'+'thill'='ANTHILL'

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(Other definitions for anthill that I've seen before include "Built-up colony" , "Many a worker here" , "lots of workers" , "Scene of great activity" , "Home for social workers?" .)

I've seen this clue in The Globe and Mail.

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