Throw out 100 on board European plane (5)
I believe the answer is:
eject
'throw out' is the definition.
(I know that eject is a more specific form of the action the throw out)
'100 on board european plane' is the wordplay.
'100' becomes 'C' (Roman numeral).
'on board' indicates putting letters inside (inserted letters are taken on board).
'european' becomes 'E' (abbreviation e.g. EU).
'plane' becomes 'jet' (jet plane).
'e'+'jet'='ejet'
'c' going into 'ejet' is 'EJECT'.
(Other definitions for eject that I've seen before include "Throw out violently" , "Expel, throw out" , "DVD player button" , "What pilot may do" , "Evict" .)