What some birds do in Virginia for sport (4)
I believe the answer is:
wade
I believe this is a double definition.
'what some birds do' is the first definition.
(as in wading birds)
'virginia for sport' is the second definition.
(tennis player Virginia Wade)
'in' is the link.
(Other definitions for wade that I've seen before include "Walk through water with difficulty" , "Paddle" , "Walk with effort through water" , "British winner of Wimbledon Singles in 1977" , "Proceed with difficulty" .)