Am returning jumper boy left behind (8)
I believe the answer is:
marooned
'left behind' is the definition.
'marooned' can be an answer for 'left' (thesaurus). I am not certain of the 'behind' bit.
'am returning jumper boy' is the wordplay.
'returning' says the letters should be written in reverse.
'jumper' becomes 'roo' (short for kangaroo, something which jumps).
'boy' becomes 'ned'.
'am' in reverse letter order is 'ma'.
'ma'+'roo'+'ned'='MAROONED'
Can you help me to learn more?
(Other definitions for marooned that I've seen before include "Me on road (anag.)" , "Abandoned like Robinson Crusoe" , "Left high and dry" , "Abandoned on island" , "Left stranded with little hope of rescue" .)