Crossword Genius

To think well of something foul is very hard (4,5)

Ross

I believe the answer is:

like stink

'very hard' is the definition.

'to think well of something foul' is the wordplay.
'to think well of' becomes 'like' (to like something is to think well of it).
'something foul' becomes 'stink' (foul smell).
'like'+'stink'='LIKE STINK'

'is' acts as a link.

I've seen this clue in The Times.
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