Sound join on tape (4)
I believe the answer is:
seem
'sound join on tape' is the definition.
'seem' can be an answer for 'sound' (I've seen this in another clue). I'm unsure of the 'join on tape' bit.
'sound join' is the wordplay.
'sound' shows a homophone (sound like).
'join' becomes 'seam' (seaming is a kind of joining).
'seam' sounds like 'SEEM'.
Can you help me to learn more?
(Other definitions for seem that I've seen before include "Appear, look" , "Come across as" , "Appear, give impression of being" , "Appear to the eye" .)