Countryman sees game-bird losing height (7)
I believe the answer is:
peasant
'countryman' is the definition.
(thesaurus)
'game-bird losing height' is the wordplay.
'game-bird' becomes 'pheasant' (I've seen this before).
'losing' is a deletion indicator.
'height' becomes 'h'.
'pheasant' with 'h' removed is 'PEASANT'.
'sees' acts as a link.
(Other definitions for peasant that I've seen before include "Yokel" , "Lowly 20 worker" , "Bumpkin" , "Poor country worker" , "Poor worker on the land" .)