Sufficiently pretty to be acceptable (10)

I believe the answer is:

fairenough

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'sufficiently' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'pretty to be acceptable' is the wordplay.
'pretty' becomes 'fair' (both can mean beautiful or attractive).
'to be acceptable' becomes 'enough' (I can't justify this - if you can you should give a lot more credence to this answer).
'fair'+'enough'='FAIRENOUGH'

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I've seen this clue in The Irish Times.

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