Crossword Genius

Caretaker of tower to meet Her Maj (6)

Ross

I believe the answer is:

keeper

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'caretaker' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(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" .)

I've seen this clue in The Independent.
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