King, say, upset, being taken in by bounders and scroungers (7)
I believe the answer is:
cadgers
'scroungers' is the definition.
('cadger' can be a synonym of 'scrounger')
'king say upset being taken in by bounders' is the wordplay.
'king' becomes 'R' (abbreviation for rex, king in Latin).
'say' becomes 'eg' (both can mean 'for example').
'upset' says the letters should be written in reverse.
'being taken in by' is an insertion indicator.
'bounders' becomes 'cads' ('cad' can be a synonym of 'bounder').
'r'+'eg'='reg'
'reg' in reverse letter order is 'ger'.
'ger' placed into 'cads' is 'CADGERS'.
'and' acts as a link.
(Another definition for cadgers that I've seen is " Beggars".)