Crossword Genius

One tucked into relation's cereal (5)

Ross

I believe the answer is:

grain

'cereal' is the definition.
('grain' can be a synonym of 'cereal')

'one tucked into relation's' is the wordplay.
'one' becomes 'i' (Roman numeral).
'tucked into' indicates putting letters inside.
'relation' becomes 'gran' (I've seen this before**).
'i' inserted into 'gran' is 'GRAIN'.

(Other definitions for grain that I've seen before include "Direction of fibres found in wood" , "basis for whisky" , "bit of corn" , "Cereal seed" , "little salty bit" .)

I've seen this clue in The Telegraph.
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