Crossword Genius

Order nicest section including posh seats (14)

Ross

I believe the answer is:

constituencies

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'seats' is the definition.
Although both the answer and definition are plural nouns, I don't understand how one could define the other.

'order nicest section including posh' is the wordplay.
'order' is an anagram indicator.
'including' means one lot of letters goes inside another.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'nicest'+'section'='nicestsection'
'nicestsection' is an anagram of 'constitencies'.
'constitencies' enclosing 'u' is 'CONSTITUENCIES'.

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I've seen this clue in The Independent.
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