Picture puzzles about public transport (7)

I believe the answer is:

rebuses

'picture puzzles' is the definition.
(I've seen this in another clue)

'about public transport' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'public transport' becomes 'buses' (I've seen this before).
're'+'buses'='REBUSES'

(Another definition for rebuses that I've seen is " Word-picture puzzles".)

I've seen this clue in the Sydney Morning Herald.

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