Sportingly, he'll give a wave (7)
I believe the answer is:
mexican
'sportingly he'll' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'a wave' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is present in the answer.
This explanation may well be incorrect...
'give' is the link.
Can you help me to learn more?
(Other definitions for mexican that I've seen before include "Latin" , "From Guadalajara or Acapulco?" , "A central American" , "From Chihuahua, perhaps" .)