Crossword Genius

As used when traveling in Bruges? (3)

Ross

I believe the answer is:

rug

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

'as used when traveling in bruges?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'in bruges?' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RUG' is hidden in the letters of 'bruges'.

Can you help me to learn more?

(Other definitions for rug that I've seen before include "Thick mat" , "A bug may be snug in it" , "Hairpiece" , "grace the boards" , "cover" .)

I've seen this clue in the Evening Standard.
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