Museum manager's almost rude about schedule (7)
I believe the answer is:
curator
'museum manager's' is the definition.
'almost rude about schedule' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'rude' becomes 'curt' (I've seen this before).
'about' shows that the letters should be reversed in order.
'schedule' becomes 'rota' (I've seen this before).
'rota' reversed gives 'ator'.
'curt' with its last letter removed is 'cur'.
'cur'+'ator'='CURATOR'
(Other definitions for curator that I've seen before include "Keeper of a collection" , "Person in charge of a museum" , "Custodian of a collection" , "Museum's administrative head" , "museum boss" .)