Support Queen, right (6)

I believe the answer is:

proper

'right' is the definition.
('proper' can be similar in meaning to 'right')

'support queen' is the wordplay.
'support' becomes 'prop' (prop is a kind of support).
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'prop'+'er'='PROPER'

(Other definitions for proper that I've seen before include "Appropriate description" , "Fit; accurate; decent" , "Genuine; part of church service" , "Genuine; correct" , "Actual" .)

I've seen this clue in The Telegraph.

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