Wreckage from planes in the morning (6)
I believe the answer is:
jetsam
'wreckage' is the definition.
(I know that jetsam is a type of wreckage)
'planes in the morning' is the wordplay.
'planes' becomes 'jets' (jet is a kind of plane).
'in the morning' becomes 'am' (AM on a clock).
'jets'+'am'='JETSAM'
'from' is the link.
(Other definitions for jetsam that I've seen before include "Flotsam and --" , "abandoned cargo" , "Material flung overboard" , "that's been dumped overboard" , "may be washed up" .)