Wrong to smear eminent conductor (7)
I believe the answer is:
maestro
'eminent conductor' is the definition.
(I've seen this before)
'wrong to smear' is the wordplay.
'wrong' indicates an anagram.
'to'+'smear'='tosmear'
'tosmear' anagrammed gives 'MAESTRO'.
(Other definitions for maestro that I've seen before include "Are most in favour of a foreign master?" , "Top conductor" , "Some art (anag.)" , "car" , "Distinguished musician - most are (anag)" .)