How rotor-head's spinning is a problem (4,3,2,3)

I believe the answer is:

hard row to hoe

'problem' is the definition.

'how rotor-head's spinning' is the wordplay.
'spinning' indicates an anagram.
'how'+'rotor'+'head'='howrotorhead'
'howrotorhead' is an anagram of 'HARD ROW TO HOE'.

'is a' is the link.

I've seen this clue in The Everyman puzzle in The Observer.

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