A reptile makes an unusual present (7)
I believe the answer is:
serpent
'a reptile' is the definition.
(I know that serpent is a type of reptile)
'an unusual present' is the wordplay.
'an unusual' is an anagram indicator.
'present' with letters rearranged gives 'SERPENT'.
'makes' acts as a link.
(Other definitions for serpent that I've seen before include "Limbless reptile" , "(In literature) a snake" , "Instrument of the past" , "Early wind instrument" , "Devil of a snake" .)