Crossword Genius

Crafty, coating vegetable in unusually smooth way (7)

Ross

I believe the answer is:

sleekly

I'm a little stuck... Click here to teach me more about this clue!

'crafty coating vegetable in unusually smooth way' is the definition.
I can't tell whether this defines the answer.

'crafty coating vegetable' is the wordplay.
I cannot quite understand how this works, but
'vegetable' could be 'leek' (leek is a kind of vegetable) and 'leek' is found within the answer.
'crafty' could be 'sly' (sly can mean crafty or cunning) and 'sly' is present in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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