Material discarded from aircraft in the morning (6)
I believe the answer is:
jetsam
'material discarded' is the definition.
(I've seen this before)
'aircraft in the morning' is the wordplay.
'aircraft' becomes 'jets' (jet is a type of aircraft).
'in the morning' becomes 'am' (short for ante meridiem - before noon).
'jets'+'am'='JETSAM'
'from' is the link.
(Other definitions for jetsam that I've seen before include "found at sea" , "Things thrown overboard and washed up ashore" , "Goods washed ashore from shipwreck" , "Ship's discharge" , "Floating wreckage" .)