Crossword Genius

Travelled overseas with leads from spaghetti westerns and mysteries (4)

Ross

I believe the answer is:

swam

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

'travelled' is the definition.
(swimming is a kind of travelling)

'overseas with leads from spaghetti westerns and mysteries' is the wordplay.
I cannot quite understand how this works, but
'with' could be 'w' (abbreviation) and 'w' is found within the answer.
The remaining letters 'sam' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for swam that I've seen before include "Did butterfly perhaps" , "Splashed around" , "Travelled through water" , "was dizzy" , "Moved through water" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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