Crossword Genius

Behind, due to a rare mix-up! (4)

Ross

I believe the answer is:

rear

'behind' is the definition.
(both can mean one's bottom)

'a rare mix-up' is the wordplay.
'mix-up' is an anagram indicator.
'rare' with letters rearranged gives 'REAR'.

'due to' acts as a link.

(Other definitions for rear that I've seen before include "Jump" , "Raise; behind" , "Posterior" , "Hindmost part" , "parent" .)

I've seen this clue in the Evening Standard.
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