Crossword Genius

Fruit, cherry in the core is more foul (6)

Ross

I believe the answer is:

uglier

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'more foul' is the definition.
Both the answer and definition are comparative adjectives. Maybe there's a link between them I don't understand?

'fruit cherry in the core' is the wordplay.
'fruit' becomes 'ugli fruit' (ugli is a kind of fruit).
'cherry in the core' becomes 'er' (I can't justify this - if you can you should believe this answer much more).
'ugli'+'er'='UGLIER'

'is' is the link.

Can you help me to learn more?

(Other definitions for uglier that I've seen before include "with worse features" , "Less beautiful" , "More hideous" , "More displeasing to the senses" , "More unattractive or repellent to the eye" .)

I've seen this clue in The Hindu.
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