Caretaker of tower to meet Her Maj (6)
I believe the answer is:
keeper
'caretaker' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for keeper that I've seen before include "Zoo worker" , "Cain asked 'Am I my brother's ......?'" , "Goalie" , "Zoo attendant" , "man at zoo" .)