Picture old song (7)

I believe the answer is:

imagine

This clue is a double definition.

'picture' is the first definition.
(picture can mean to visualise or imagine)

'old song' is the second definition.
(song by John Lennon)

(Other definitions for imagine that I've seen before include "that Lennon composed" , "Conjure up in mind,fancy" , "Assume" , "Form a mental image in the mind" , "John Lennon hit" .)

I've seen this clue in The Telegraph.

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