Crossword Genius

Grain of loathing (3)

Ross

I believe the answer is:

oat

'grain' is the definition.
(I know that oat is a type of grain)

'of loathing' is the wordplay.
'of' indicates a hidden word.
'OAT' is hidden within 'loathing'.

(Other definitions for oat that I've seen before include "Cereal grass" , "Basis of porridge" , "Cereal plant" , "Cereal (singular)" , "Food grain" .)

I've seen this clue in The Mirror.
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