Scrap in plane -- it's about lad (8)
I believe the answer is:
jettison
'scrap' is the definition.
(I've seen this before)
'plane it's about lad' is the wordplay.
'plane' becomes 'jet' (jet plane).
'about' says the letters should be written in reverse.
'lad' becomes 'son' (lad can informally mean a young boy).
'it' written backwards gives 'ti'.
'jet'+'ti'+'son'='JETTISON'
'in' acts as a link.
(Other definitions for jettison that I've seen before include "Throw away (from ship or aeroplane?)" , "Eject" , "Deliberately dump overboard" , "scrap" , "Abandon or throw overboard" .)