Dove, flying among trees, agitating docker (9)
I believe the answer is:
stevedore
'docker' is the definition.
(synonyms)
'dove flying among trees agitating' is the wordplay.
'flying' indicates anagramming the letters (letters fly around into new positions).
'among' means one lot of letters goes inside another (inserted letters are placed among others).
'agitating' indicates an anagram.
'dove' is an anagram of 'vedo'.
'trees' is an anagram of 'stere'.
'vedo' placed into 'stere' is 'STEVEDORE'.
(Other definitions for stevedore that I've seen before include "Unloader of shipping vessels" , "Hold worker" , "Dock-worker loads and unloads ships" , "Worker who loads and unloads ships" , "one working in docks" .)