Labourer (originally on a canal) (5)

I believe the answer is:

navvy

(Other definitions for navvy that I've seen before include "Labourer, originally digging the canals" , "Canal labourer" , "Labourer working on canals, roads, railways etc?" , "Construction labourer" , "Construction worker" .)

I've seen this clue in The Times.

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