Popular cereal dye (7)

I believe the answer is:

ingrain

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

'popular cereal' is the wordplay.
'popular' becomes 'in'.
'cereal' becomes 'grain' ('grain' can be a synonym of 'cereal').
'in'+'grain'='INGRAIN'

(Other definitions for ingrain that I've seen before include "Impress deeply on the mind" , "dye thus" , "Firmly establish (habit)" , "Plant firmly" , "Fix" .)

I've seen this clue in The Independent.

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