Muscateer? That's spelt wrong, I moan! (5)
I believe the answer is:
omani
'muscateer?' is the definition.
(I've seen this in another clue)
'wrong i moan' is the wordplay.
'wrong' is an anagram indicator.
'i'+'moan'='imoan'
'imoan' anagrammed gives 'OMANI'.
'that's spelt' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for omani that I've seen before include "Middle East national" , "Someone from Muscat" , "Gulf native" , "Citizen of a country, capital Muscat" , "Naomi (anag) -- from Muscat?" .)