Turkey parasite cut from a bird all aquiver (9)
I believe the answer is:
tremulous
'aquiver' is the definition.
(thesaurus)
'turkey parasite cut' is the wordplay.
'turkey' becomes 'tr' (abbreviation eg in internet addresses).
'parasite cut' becomes 'emulous' (I can't justify this - if you can you should believe this answer much more).
'tr'+'emulous'='TREMULOUS'
'from a bird all' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for tremulous that I've seen before include "Quavering" , "Timid; quivering" , "Timid; shaking" , "Shaking, quivering" , "Slightly shaking" .)