They may dig verse included in blues (7)

I believe the answer is:

navvies

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'they may dig' is the definition.
The definition suggests an adverb but the answer is not.

'verse included in blues' is the wordplay.
'verse' becomes 'v'.
'included in' means one lot of letters goes inside another.
'blues' becomes 'navies' (navy is a kind of blue).
'v' inserted inside 'navies' is 'NAVVIES'.

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(Other definitions for navvies that I've seen before include "Construction labourers" , "Labourers working on the roads" , "Van's I've found full of manual road workers" .)

I've seen this clue in The Times.

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