Nothing about a European cosmetic (4,6)
I believe the answer is:
nail polish
'cosmetic' is the definition.
(I know that nail polish is a type of cosmetic)
'nothing about a european' is the wordplay.
'nothing' becomes 'nil' (eg nil is zero in football).
'about' is an insertion indicator.
'european' becomes 'polish' (Poland is in Europe).
'nil' going around 'a' is 'nail'.
'nail'+'polish'='NAIL POLISH'
(Other definitions for nail polish that I've seen before include "digital application" , "digital coverage" , "cosmetic" .)