Rowing team swallowed audibly (5)
I believe the answer is:
eight
'rowing team' is the definition.
(I've seen this before)
'swallowed audibly' is the wordplay.
'swallowed' becomes 'ate' (swallow can mean to eat).
'audibly' shows a homophone (sound like).
'ate' is a homophone of 'EIGHT'.
(Other definitions for eight that I've seen before include "Carmina Burana composer" , "Several in a row" , "Rowing boat crew" , "Figure" , "4x2" .)