They work below ground (6)

I believe the answer is:

miners

'they work below ground' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for miners that I've seen before include "They work below ground" , "They excavate the earth" , "Labourers below ground" , "out in 1972?" , "Pit workers" .)

I've seen this clue in The Irish Times.

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