Sisters experience taking out first European young boys (7)
I believe the answer is:
shavers
'young boys' is the definition.
(shaver can mean a young boy)
'sisters experience taking out first european' is the wordplay.
I cannot really understand how this works, but
'experience' could be 'have' (synonyms) and 'have' is found within the answer.
This explanation may well be incorrect...
(Other definitions for shavers that I've seen before include "Male hair-removers or their razors" , "Young people" .)