Crossword Genius

It's a tall order requiring to be posh (4-5)

Ross

I believe the answer is:

high-class

'to be posh' is the definition.
(I've seen this before)

'it's a tall order' is the wordplay.
'it's a tall' becomes 'high' (I've seen this before).
'order' becomes 'class' (I've seen this in another clue).
'high'+'class'='HIGH-CLASS'

'requiring' is the link.

(Other definitions for high-class that I've seen before include "Posh" , "Superior" .)

I've seen this clue in The Globe and Mail.
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