Tanneries working purposefully (2,7)

I believe the answer is:

in earnest

'purposefully' is the definition.
(I've seen this before)

'tanneries working' is the wordplay.
'working' indicates anagramming the letters.
'tanneries' is an anagram of 'IN EARNEST'.

(Other definitions for in earnest that I've seen before include "Not joking" , "with enthusiasm" , "With serious intentions" , "showing determination" , "Purposefully" .)

I've seen this clue in The Times.

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