Right to support the Queen (6)
I believe the answer is:
proper
'right' is the definition.
(I know that right can be written as proper)
'support the queen' is the wordplay.
'support' becomes 'prop' (prop up can mean to support).
'the queen' becomes 'ER' (Elizabeth Regina).
'prop'+'er'='PROPER'
'to' is the link.
(Other definitions for proper that I've seen before include "part of Mass" , "Right, correct or appropriate" , "Genuine; respectable" , "Appropiate, right" , "Correct; respectable" .)