Crossword Genius

Something traveller has seen with visit abroad, observing capitals? (4-9)

Ross

I believe the answer is:

case-sensitive

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

'something traveller' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'seen with visit abroad observing capitals?' is the wordplay.
I cannot really understand how this works, but
an anagram of 'seen' is 'esen' which is within the answer.
an anagram of 'visit' is 'sitiv' which is present in the answer.
The remaining letters 'case' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'has' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.
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