Amateur unusually entitled to bring in volunteers (10)
I believe the answer is:
dilettante
'amateur' is the definition.
(dilettante is a kind of amateur)
'unusually entitled to bring in volunteers' is the wordplay.
'unusually' is an anagram indicator.
'to bring in' means one lot of letters goes inside another.
'volunteers' becomes 'ta' (abbreviation for Territorial Army).
'entitled' is an anagram of 'diletnte'.
'diletnte' enclosing 'ta' is 'DILETTANTE'.
(Other definitions for dilettante that I've seen before include "Superficial art lover" , "amateur artist" , "Amateur art lover" , "Arty type" , "One with superficial knowledge" .)