Crossword Genius

John, name for diver (4)

Ross

I believe the answer is:

loon

'diver' is the definition.
(I know that diver can be written as loon)

'john name' is the wordplay.
'john' becomes 'loo' (loo is a kind of john).
'name' becomes 'n' (common abbreviation e.g. on forms).
'loo'+'n'='LOON'

'for' acts as a link.

(Other definitions for loon that I've seen before include "Simple-minded person" , "Silly person (colloq.)" , "Fish-eating diving bird" , "Diving bird with wild cry - sounds crazy" , "US bird is also a silly person?" .)

I've seen this clue in The Guardian.
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