Uncalled for as one introduces songs for one Conservative (11)
I believe the answer is:
unsolicited
'uncalled for' is the definition.
(thesaurus)
'one introduces songs for one conservative' is the wordplay.
'one' becomes 'united' (synonyms).
'introduces' means one lot of letters goes inside another.
'songs for one' becomes 'soli' (I've seen this in another clue).
'conservative' becomes 'C' (UK political abbreviation).
'soli'+'c'='solic'
'united' going around 'solic' is 'UNSOLICITED'.
'as' acts as a link.
(Other definitions for unsolicited that I've seen before include "Without invitation" , "Not asked for" .)