Trouble with English sailors netting duck's wing part (7)
I believe the answer is:
aileron
'wing part' is the definition.
('aileron' is part of 'wing')
'trouble with english sailors netting duck's' is the wordplay.
'trouble with' becomes 'ail' (synonyms. I am not sure about the 'with' bit.).
'english' becomes 'e' (abbreviation).
'sailors' becomes 'rn' (abbreviation for Royal Navy).
'netting' means one lot of letters goes inside another (net can mean to contain or capture).
'duck' becomes 'o'.
'rn' enclosing 'o' is 'ron'.
'ail'+'e'+'ron'='AILERON'
(Other definitions for aileron that I've seen before include "Near oil (anag)" , "An oriel (anag.); plane part" , "Aircraft control flap" , "Aircraft control surface" , "Trailing-edge flap" .)