Glorify Good Queen providing accommodation for fifty (5)
I believe the answer is:
bless
'glorify' is the definition.
(I've seen this in another clue)
'good queen providing accommodation for fifty' is the wordplay.
'good queen' becomes 'bess' (Good Queen Bess was a nickname of Elizabeth I).
'providing accommodation for' means one lot of letters goes inside another.
'fifty' becomes 'l' (Roman numeral).
'bess' placed around 'l' is 'BLESS'.
(Other definitions for bless that I've seen before include "Anoint" , "Approve of" , "Sanctify" , "Give benediction" , "Invoke divine favour on" .)