An eccentric minority are busily cleaning fruit (7,6)

I believe the answer is:

lunatic fringe

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'an eccentric minority' is the definition.
(I've seen this before)

'busily cleaning fruit' is the wordplay.
'cleaning fruit' anagrams to 'LUNATIC FRINGE'.
Though, I am not sure how this is indicated.

'are' is the link.

Can you help me to learn more?

(Other definitions for lunatic fringe that I've seen before include "Eccentric minority" , "Extreme party members" , "fruitcakes around the edge?" , "Extreme members of group" , "People who support extreme views" .)

I've seen this clue in the Sydney Morning Herald.

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