A deer, it has one foot drawn back (6)
I believe the answer is:
wapiti
This clue could be a double definition.
'a deer' is the first definition.
(I know that wapiti is a type of cervid)
'it has one foot drawn back' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for wapiti that I've seen before include "Deer with much-branched antlers" , "Large N. Am. red deer" , "Animal" , "North American native" , "I paw it (anag) - large North American deer" .)