Someone who lets engaging European enlist again (2-5)
I believe the answer is:
re-enter
'someone who lets engaging european' is the definition.
The answer and definition are not the same part of speech.
'enlist again' is the wordplay.
I cannot quite see how this works, but
'enlist' could be 'enter' (I've seen this in another clue) and 'enter' is found in the answer.
'again' could be 're' (prefix meaning 'again') and 're' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for re-enter that I've seen before include "Go back in" , "compete again" , "Come back inside" , "Come or go in again" .)