Radical part of text remembered (7)

I believe the answer is:

extreme

'radical' is the definition.
(radical can mean revolutionary or extreme)

'part of text remembered' is the wordplay.
'part of' says the answer is hidden in the clue.
'EXTREME' is hidden within 'text remembered'.

(Other definitions for extreme that I've seen before include "Furthest or highest degree of something" , "Far beyond the norm" , "Farthest limit" , "Very intense - way-out" , "Uttermost" .)

I've seen this clue in The Daily Express.

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