Direct last UNESCO missions (10)

I believe the answer is:
consulates
'missions' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.
'direct last unesco' is the wordplay.
'direct' indicates anagramming the letters (I've seen 'directed' mean this).
'last'+'unesco'='lastunesco'
'lastunesco' is an anagram of 'CONSULATES'.
Can you help me to learn more?
(Another definition for consulates that I've seen is " diplomats in these".)
I've seen this clue in The Independent.
Want a hint initially instead of a full solution?
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