Crossword Genius

Unusually long feature film’s rating dispute entertaining writer? (7)

Ross

I believe the answer is:

unibrow

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'unusually long feature film's' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'rating dispute entertaining writer?' is the wordplay.
'rating' becomes 'u' (I can't justify this - if you can you should give a lot more credence to this answer).
'dispute' becomes 'row' (row is a kind of dispute).
'entertaining' indicates putting letters inside (inviting in, as for dinner).
'writer?' becomes 'nib' (something which writes).
'u'+'row'='urow'
'urow' enclosing 'nib' is 'UNIBROW'.

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I've seen this clue in The Times.
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