Rudely having feature of shoe at edges, not lovely (10)

'rudely' is the definition.
Both the definition and answer are adverbs. Maybe there's an association between them I don't understand?

'feature of shoe at edges not lovely' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is found within the answer.
'at' could be 'in' (synonymous in some cases - eg at school, in school) and 'in' is found in the answer.
'not' could be 'nt' (synonyms) and 'nt' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'having' acts as a link.

Can you help me to learn more?