Crossword Genius

Tough concealing dope while travelling (2,7)

Ross

I believe the answer is:

in transit

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'while travelling' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for in transit that I've seen before include "While being conveyed" , "during journey" , "Being transported" , "En route" , "On its way" .)

I've seen this clue in The Hindu.
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