Pretentious uniform United hire out around November (9)

I believe the answer is:

flatulent

I'm a little stuck... Click here to teach me more about this clue!

'pretentious' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

'uniform united hire out around november' is the wordplay.
'uniform' becomes 'flat' (I've seen this in other clues).
'united' becomes 'U' (abbreviation).
'hire out' becomes 'let' (I've seen this in another clue).
'around' is an insertion indicator.
'november' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'let' placed around 'n' is 'lent'.
'flat'+'u'+'lent'='FLATULENT'

Can you help me to learn more?

(Other definitions for flatulent that I've seen before include "Suffering from excessive intestinal gas" , "Suffering from wind or gas" .)

I've seen this clue in The Times.

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