Young hare making vet reel unsteadily (7)
I believe the answer is:
leveret
'young hare' is the definition.
(I've seen this before)
'vet reel unsteadily' is the wordplay.
'unsteadily' indicates anagramming the letters.
'vet'+'reel'='vetreel'
'vetreel' anagrammed gives 'LEVERET'.
'making' acts as a link.
(Other definitions for leveret that I've seen before include "Small hopper" , "Baby hare" , "Young animal" , "Hare in its first year" , "Little beast" .)