Crossword Genius

Track source on the telephone? (5)

Ross

I believe the answer is:

route

'track' is the definition.
(I've seen this before)

'source on the telephone?' is the wordplay.
'source' becomes 'root' (both can mean the origin of something).
'on the telephone?' indicates a 'sounds like' (homophone) clue (how it might sound over the phone).
'root' sounds like 'ROUTE'.

(Other definitions for route that I've seen before include "Established line of travel" , "Way of getting from A to B" , "The way to get somewhere" , "Way, line" , "Way, path" .)

I've seen this clue in The Guardian.
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