Crossword Genius

Variety of mineral required for those working on the track (7)

Ross

I believe the answer is:

railmen

I'm a little stuck... Click here to teach me more about this clue!

'for those working on the track' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'variety of mineral' is the wordplay.
'variety of' indicates anagramming the letters.
'mineral' with letters rearranged gives 'RAILMEN'.

'required' acts as a link.

Can you help me to learn more?

(Other definitions for railmen that I've seen before include "Train under their supervision" , "On-line workers" , "They've made tracks" .)

I've seen this clue in The Irish Independent.
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