Tramping around nursing a grouse (9)
I believe the answer is:
ptarmigan
'grouse' is the definition.
(ptarmigan is a kind of grouse)
'tramping around nursing a' is the wordplay.
'around' indicates an anagram.
'nursing' is an insertion indicator.
'tramping' with letters rearranged gives 'ptarmign'.
'ptarmign' placed around 'a' is 'PTARMIGAN'.
(Other definitions for ptarmigan that I've seen before include "One flying" , "Grouse - giant pram (anag)" , "Grouse-like bird" , "Game bird living the high life" , "Type of mountain grouse" .)