Artist in hut upset about climbing equipment (9)

I believe the answer is:

carabiner

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'climbing equipment' is the definition.
The definition suggests a singular noun which matches the answer.

'artist in hut upset' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'in' is an insertion indicator.
'hut' becomes 'cabin' (I've seen this before).
'upset' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ra' inserted within 'cabin' is 'carabin'.
'carabin'+'er'='CARABINER'

'about' is the link.

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I've seen this clue in The Guardian.

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