Bird to go round being heard (4)
I believe the answer is:
tern
'bird' is the definition.
(tern is a kind of bird)
'go round being heard' is the wordplay.
'go round' becomes 'turn'.
'being heard' shows a homophone (sound like).
'turn' sounds like 'TERN'.
'to' acts as a link.
(Other definitions for tern that I've seen before include "Fork-tailed seabird" , "Small slender gull" , "Gull-like seabird" , "Seabird related to the gull" , "Three-masted schooner" .)