Crossword Genius

May return small tubers (4)

Ross

I believe the answer is:

yams

'tubers' is the definition.
(yam is a kind of tuber)

'may return small' is the wordplay.
'return' says the letters should be written in reverse.
'small' becomes 's' (abbreviation - e.g. clothes size).
'may' written backwards gives 'yam'.
'yam'+'s'='YAMS'

(Other definitions for yams that I've seen before include "Edible tubers from the tropics" , "Sweet potatoes" , "Roots" , "vegetables" .)

I've seen this clue in The Mirror.
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