Crossword Genius

Something you might find puzzling on public transport (5)

Ross

I believe the answer is:

rebus

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'something you might find puzzling' is the definition.
I know that 'puzzling' relates to this answer.

'on public transport' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'public transport' becomes 'bus' (bus is a kind of public transport).
're'+'bus'='REBUS'

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(Other definitions for rebus that I've seen before include "Puzzle where pictures represent syllables and words" , "Pictorial pun - fictional detective" , "Pictorial wordplay" , "Pun picture puzzle" , "Word puzzle involving pictures" .)

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