Unusually creditable and moral politician (7,8)
I believe the answer is:
liberal democrat
'politician' is the definition.
(the Liberal Democrats are a UK political party)
'unusually creditable and moral' is the wordplay.
'unusually' indicates anagramming the letters.
'and' says to put letters next to each other.
'creditable' after 'moral' is 'moralcreditable'.
'moralcreditable' anagrammed gives 'LIBERAL DEMOCRAT'.
(Other definitions for liberal democrat that I've seen before include "Politician" , "party person" , "Party member" , "Cable, say" .)