Crossword Genius

A very small measure of corn (5)

Ross

I believe the answer is:

grain

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'a very small measure' is the first definition.
'grain' can be an answer for 'measure' (grain is a kind of measure). I'm unsure of the 'a very small' bit.

'corn' is the second definition.
(I've seen this before)

'of' acts as a link.

Can you help me to learn more?

(Other definitions for grain that I've seen before include "Small quantity (of corn etc)" , "Eg, wheat" , "Cereal as food" , "Tiny amount" , "Character" .)

I've seen this clue in The Globe and Mail.
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