Track workers moving around main glens (9)

I believe the answer is:

signalmen

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'track workers' is the definition.
'signalmen' can be an answer for 'workers' (signalman is a kind of worker). I am not certain of the 'track' bit.

'moving around main glens' is the wordplay.
'moving around' is an anagram indicator.
'main'+'glens'='mainglens'
'mainglens' anagrammed gives 'SIGNALMEN'.

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I've seen this clue in The Independent.

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