Might prisoner meet the Queen? (5)
I believe the answer is:
power
'might' is the definition.
('power' can be a synonym of 'might')
'prisoner meet the queen?' is the wordplay.
'prisoner' becomes 'pow' (POW is an example).
'meet' is a charade indicator (letters next to each other).
'the queen?' becomes 'er' (Elizabeth Regina).
'pow'+'er'='POWER'
(Other definitions for power that I've seen before include "Supremacy, force" , "index" , "- - of attorney" , "Force, controlling influence 95)" , "Force - potentiality" .)