American sweet potato (3)

I believe the answer is:

yam

'american sweet potato' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for yam that I've seen before include "May be a foreign potato" , "Tropical climber" , "Potato-like vegetable" , "vegetable plant" , "US sweet-potato" .)

I've seen this clue in The Irish Times.

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