George of England perhaps, unlikely star in panto (6,5)
I believe the answer is:
patron saint
'george of england perhaps' is the definition.
(St George)
'unlikely star in panto' is the wordplay.
'unlikely' indicates an anagram.
'star'+'in'+'panto'='starinpanto'
'starinpanto' with letters rearranged gives 'PATRON SAINT'.
(Other definitions for patron saint that I've seen before include "Holy guardian of country, trade etc" , "Religious guardian" , "Virgin Mary in France possibly" , "Unearthly guardian" , "Patrick for Ireland, for example" .)