Rascal wrong to travel (6)

I believe the answer is:

varlet

I'm a little stuck... Click here to teach me more about this clue!

'rascal' is the definition.
(I know that rascal can be written as varlet)

'wrong to travel' is the wordplay.
'travel' can be anagrammed to 'VARLET'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for varlet that I've seen before include "Travel with old rascal" , "Aged attendant" , "Travel (anag) - rascal (archaic)" , "Travel around with old rogue" .)

I've seen this clue in the Evening Standard.

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