Crossword Genius

Feeble person taken aback by mathematician showing off (9)

Ross

I believe the answer is:

posturing

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

'feeble person taken aback by mathematician' is the wordplay.
'feeble person' becomes 'sop'.
'taken aback' says the letters should be written backwards.
'by' is a charade indicator (letters next to each other).
'mathematician' becomes 'turing' (Alan Turing).
'sop' back-to-front 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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