Crossword Genius

Not quite top drawer coder is showing off (9)

Ross

I believe the answer is:

posturing

'is showing off' is the definition.
(I've seen this before)

'not quite top drawer coder' is the wordplay.
'not quite' means to remove the last letter.
'top drawer' becomes 'posh' (top drawer can mean posh or upper-class).
'coder' becomes 'Turing' (cryptographer Alan Turing).
'posh' with its last letter removed is 'pos'.
'pos'+'turing'='POSTURING'

(Another definition for posturing that I've seen is " showing off".)

I've seen this clue in The Guardian.
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