Crossword Genius

Mount perhaps and start on a journey (3,3)

Ross

I believe the answer is:

set off

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This clue could be a double definition.

'mount perhaps' is the first definition.
'set off' can be an answer for 'mount' (thesaurus). I am unsure of the 'perhaps' bit.

'start on a journey' is the second definition.
(I've seen this before)

'and' acts as a link.

Can you help me to learn more?

(Other definitions for set off that I've seen before include "Begin journey or cause to ignite" , "Begin journey or explode bomb" , "Begin journey or detonate bomb" , "show to advantage" , "Explode; start journey" .)

I've seen this clue in The Globe and Mail.
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