Deer turns over something with one foot (6)
I believe the answer is:
wapiti
'deer' is the definition.
(wapiti is a kind of deer)
'turns over something with one foot' is the wordplay.
'turns over' says the letters should be written backwards.
'something' becomes 'it' (both can refer to an object).
'with' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'foot' becomes 'paw' (paw is a kind of foot).
'it'+'i'+'paw'='itipaw'
'itipaw' written backwards gives 'WAPITI'.
(Other definitions for wapiti that I've seen before include "North American native" , "Animal" , "I paw it (anag) - large North American deer" , "Large N. Am. red deer" , "Red deer - I paw it (anag)" .)