John Lennon song (7)

I believe the answer is:

imagine

'john lennon song' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for imagine that I've seen before include "Suspect" , "Picture mentally" , "Conceive; fancy" , "Picture in one's mind" , "Conjure up in mind,fancy" .)

I've seen this clue in The Guardian and The Telegraph.

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