Official in the museum where the dog upset the table (7)
I believe the answer is:
curator
'official' is the definition.
(I know that curator is a type of official)
'dog upset the table' is the wordplay.
'dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'upset the table' becomes 'ator' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cur'+'ator'='CURATOR'
'in the museum where the' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for curator that I've seen before include "museum boss" , "Keeper of a collection" , "Museum official" , "Museum custodian" , "man in the museum?" .)