Such mining is available to actors (4-4)

I believe the answer is:

open-cast

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'such mining' is the definition.
'open-cast' can be an answer for 'mining' (mining minerals from the surface). I'm not certain of the 'such' bit.

'available to actors' is the wordplay.
'available' becomes 'open' (similar in meaning).
'to actors' becomes 'cast' (group of actors).
'open'+'cast'='OPEN-CAST'

'is' is the link.

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I've seen this clue in the Evening Standard.

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