Some deride a teacher … imagine (6)

I believe the answer is:

ideate

'imagine' is the definition.
(I know that imagine can be written as ideate)

'some deride a teacher' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'IDEATE' is hidden within 'deride a teacher'.

(Other definitions for ideate that I've seen before include "Imagine (psychology), aid tee (anag.)" , "Fancy" , "Form in the imagination" , "Form a picture of" .)

I've seen this clue in The Sunday Times and The Times.

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