Bird gets wing-tip trapped in gnarled tree (5)
I believe the answer is:
egret
'bird' is the definition.
(I know that egret is a type of heron)
'wing-tip trapped in gnarled tree' is the wordplay.
'tip' says to take the final letters.
'trapped in' indicates putting letters inside.
'gnarled' indicates anagramming the letters (I've seen this in other clues).
The final letter of 'wing' is 'g'.
'tree' is an anagram of 'eret'.
'g' going into 'eret' is 'EGRET'.
'gets' acts as a link.
(Other definitions for egret that I've seen before include "Wader with white plumage" , "Stork-like bird" , "One of a pair of waders" , "Greet (anag) -- wading bird" , "young bird" .)