European laser beams? Not entirely! (4)
I believe the answer is:
serb
'european' is the definition.
(Serb is a type of European)
'laser beams? not entirely' is the wordplay.
'not entirely' indicates a hidden word.
'SERB' is hidden in the letters of 'laser beams'.
(Other definitions for serb that I've seen before include "Eg, native of Belgrade" , "One from Belgrade" , "Balkan native" , "Someone from Belgrade?" , "From Belgrade, perhaps" .)