Most remote bird eating leeks on occasion (7)

I believe the answer is:

coolest

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'most remote' is the definition.
Both the answer and definition are superlative adjectives. Maybe they are linked in a way I don't understand?

'bird eating leeks on occasion' is the wordplay.
'bird' becomes 'coot' (coot is a kind of bird).
'eating' indicates putting letters inside.
'on occasion' indicates alternate letters.
The alternate letters of 'leeks' are 'les'.
'coot' going around 'les' is 'COOLEST'.

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(Another definition for coolest that I've seen is " Most impudent".)

I've seen this clue in The Independent.

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