Crossword Genius

Conclude Panama, say, is not productive (9)

Ross

I believe the answer is:

infertile

'is not productive' is the definition.
(I've seen this before)

'conclude panama' is the wordplay.
'conclude' becomes 'infer' (inferring is a kind of concluding).
'panama' becomes 'tile' (type of hat - tile could historically mean a hat).
'infer'+'tile'='INFERTILE'

'say' is the link.

(Other definitions for infertile that I've seen before include "Barren" , "So can't father" , "Fruitless" , "Not productive" .)

I've seen this clue in The Times.
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