Weak king working with Government is incorrect (5)
I believe the answer is:
wrong
'incorrect' is the definition.
(I know that incorrect can be written as wrong)
'weak king working with government' is the wordplay.
'weak' becomes 'w' (physics symbol as in W-boson).
'king' becomes 'R' (abbreviation for rex, king in Latin).
'working' becomes 'on' (e.g. a machine is working or on).
'with' means one lot of letters go next to another.
'government' becomes 'g' (abbreviation for government).
'w'+'r'+'on'+'g'='WRONG'
'is' is the link.
(Other definitions for wrong that I've seen before include "Inappropriate" , "Failing to come right" , "Unjust - incorrect" , "Injury - incorrect" , "Not correct" .)