A new role in flight control (7)
I believe the answer is:
aileron
'flight control' is the definition.
(I've seen this before)
'a new role in' is the wordplay.
'new' indicates anagramming the letters.
'role'+'in'='rolein'
'rolein' with letters rearranged gives 'ileron'.
'a'+'ileron'='AILERON'
(Other definitions for aileron that I've seen before include "An oriel, strangely, on an aircraft" , "Wing control flap" , "Hinged flap on aircraft wing" , "Hinged part of a plane's wing" , "Trailing-edge flap" .)