Refers to someone blithely rejecting bill (4)
I believe the answer is:
they
'refers to someone' is the definition.
I can't tell whether this definition defines the answer.
'blithely rejecting bill' is the wordplay.
'rejecting' indicates named letters should be taken away.
'blithely' with 'bill' taken away is 'THEY'.
Can you help me to learn more?
(Other definitions for they that I've seen before include "Pronoun for more than one" , "Do -- Know It's Christmas (Band Aid)" , "People generally" , "Those people (vb. subject)" , "Third person plural" .)