Trade union wrangling revolted flyer (10)
I believe the answer is:
turtledove
'flyer' is the definition.
(type of bird - something which flies)
'trade union wrangling revolted' is the wordplay.
'trade union' becomes 'TU' (abbreviation for trade union).
'wrangling' indicates an anagram (wrangle can mean to round up and organise).
'revolted' is an anagram of 'rtledove'.
'tu'+'rtledove'='TURTLEDOVE'
(Other definitions for turtledove that I've seen before include "Bird given on the second day of Christmas" , "Loving bird" , "Apparently affectionate bird" , "Bird noted for attention to its mate" .)