Sounds like true angler's device (4)
I believe the answer is:
reel
'angler's device' is the definition.
(I've seen this in another clue)
'sounds like true' is the wordplay.
'sounds like' shows a homophone (sound like).
'true' becomes 'real' (synonyms).
'real' sounds like 'REEL'.
(Other definitions for reel that I've seen before include "Photographer's and anglers spool" , "Dance; winding drum" , "Cylinder on which something is wound" , "Fishing rod attachment" , "Rock" .)