Perhaps Ed's pun upsets (6)

I believe the answer is:

upends

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'perhaps' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'ed's pun upsets' is the wordplay.
'upsets' indicates anagramming the letters.
'eds'+'pun'='edspun'
'edspun' anagrammed gives 'UPENDS'.

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(Other definitions for upends that I've seen before include "Send up in reverses" , "Stands bottom over top" , "Turns upside down, overturns" , "affects to a great extent" .)

I've seen this clue in The Irish Independent.

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