Earldoms? Do not present incorrectly as provinces (6)
I believe the answer is:
realms
'provinces' is the definition.
(I've seen this in another clue)
'earldoms? do not present' is the wordplay.
'not' is a deletion indicator.
'present' indicates an anagram (I've seen 'presenting' mean this).
'earldoms' with 'do' taken away is 'earlms'.
'earlms' is an anagram of 'REALMS'.
'incorrectly as' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for realms that I've seen before include "Domains ruled by king or queen" , "Kingdoms, or fields of interest" , "areas of interest" , "Domains - provinces" , "regions" .)