Line caught by expert (5)
I believe the answer is:
cable
'line' is the definition.
(I know that line can be written as cable)
'caught by expert' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'by' means one lot of letters go next to another.
'expert' becomes 'able' (able can mean expert or talented).
'c'+'able'='CABLE'
(Other definitions for cable that I've seen before include "Strong suspension bridge made of wire" , "Wire, flex" , "Rope; message" , "Strong rope made of twisted strands of hemp, nylon or steel wire" , "Telegraph" .)