Crossword Genius

Behind so petite? Bum irrelevant (6,3,5)

Ross

I believe the answer is:

beside the point

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

'behind so petite? bum' is the wordplay.
'bum' is an anagram indicator (bum can mean faulty or wrong).
'behind'+'so'+'petite'='behindsopetite'
'behindsopetite' with letters rearranged gives 'BESIDE THE POINT'.

(Other definitions for beside the point that I've seen before include "Irrelevant" , "Sentence starts or ends here" , "as the end of sentence?" , "It's immaterial" .)

I've seen this clue in The Guardian.
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