Discovers large nets (6)

I believe the answer is:

learns

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'discovers' is the definition.
('learn' can be a synonym of 'discover')

'large nets' is the wordplay.
'large' becomes 'l'.
'nets' becomes 'earns' (I can't justify this - if you can you should believe this answer much more).
'l'+'earns'='LEARNS'

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(Other definitions for learns that I've seen before include "Finds out" , "Imbibes knowledge" , "Gains understanding from study or experience" , "Gains knowledge or skills" , "Acquires knowledge or skills" .)

I've seen this clue in The Guardian.

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