It suits a solitary traveller to be untalkative (5)

I believe the answer is:

sulky

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'it suits a solitary traveller' is the definition.
The definition suggests a singular noun which matches the answer.

'be untalkative' is the wordplay.
'be' becomes 'sulk' (sulking is a kind of being).
'untalkative' becomes 'y' (I can't explain this - if you can you should give a lot more credence to this answer).
'sulk'+'y'='SULKY'

'to' is the link.

Can you help me to learn more?

(Other definitions for sulky that I've seen before include "Moody" , "Sullen" , "Petulant" , "Morose" .)

I've seen this clue in the Evening Standard.

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