Repeat programme showing Her Majesty in control (5)
I believe the answer is:
rerun
'repeat programme' is the definition.
(I've seen this before)
'her majesty in control' is the wordplay.
'her majesty' becomes 'er' (Elizabeth Regina).
'in' means one lot of letters goes inside another.
'control' becomes 'run' (I've seen this before**).
'er' inserted into 'run' is 'RERUN'.
'showing' is the link.
(Other definitions for rerun that I've seen before include "Repeat (of race etc)" , "Show (eg, film) again" , "Repeat programme" , "Film or programme broadcast again" , "Repeat performance" .)