Suffer in part of aircraft, crying loudly (7)
I believe the answer is:
wailing
'crying loudly' is the definition.
'suffer in part of aircraft' is the wordplay.
'suffer' becomes 'ail' (ailing is a kind of suffering).
'in' means one lot of letters goes inside another.
'part of aircraft' becomes 'wing' (I've seen this before).
'ail' placed within 'wing' is 'WAILING'.
(Other definitions for wailing that I've seen before include "Greeting" , "Jerusalem site sacred to Jews for prayer and lamentation" .)