Remove European plane holding 100 (5)
I believe the answer is:
eject
'remove' is the definition.
(thesaurus)
'european plane holding 100' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'plane' becomes 'jet' (jet plane is a kind of plane).
'holding' is an insertion indicator.
'100' becomes 'c' (roman numeral).
'jet' placed around 'c' is 'ject'.
'e'+'ject'='EJECT'
(Other definitions for eject that I've seen before include "Throw out violently" , "What pilot may do" , "Turn out" , "Boot out" , "Discharge; evacuate" .)