Euro MP worried about current mass market (8)
I believe the answer is:
emporium
'market' is the definition.
(thesaurus)
'euro mp worried about current mass' is the wordplay.
'worried' is an anagram indicator.
'about' means one lot of letters goes inside another.
'current' becomes 'I' (symbol for electric current).
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'euro'+'mp'='euromp'
'euromp' is an anagram of 'emporu'.
'emporu' enclosing 'i' is 'emporiu'.
'emporiu'+'m'='EMPORIUM'
(Other definitions for emporium that I've seen before include "Large retail store with many departments" , "Big shop" , "Make up memoir about a very large shop" , "A large shop or centre of commerce" , "A large imposing shop" .)