Crossword Genius

He's fit: man working in tunnel underground (9)

Ross

I believe the answer is:

mineshaft

'tunnel underground' is the definition.
(type of underground tunnel)

'he's fit man working' is the wordplay.
'working' indicates an anagram.
'hes'+'fit'+'man'='hesfitman'
'hesfitman' with letters rearranged gives 'MINESHAFT'.

'in' is the link.

(Other definitions for mineshaft that I've seen before include "not a feature of 4, 21 [OPENCAST MINING]" , "Vertical hole" , "one's got bored" .)

I've seen this clue in The Times.
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