Crossword Genius

An accident messed up his map (6)

Ross

I believe the answer is:

mishap

'an accident' is the definition.
(mishap is a kind of accident)

'messed up his map' is the wordplay.
'messed up' indicates anagramming the letters.
'his'+'map'='hismap'
'hismap' anagrammed gives 'MISHAP'.

(Other definitions for mishap that I've seen before include "Contretemps" , "An accident, piece of bad luck" , "Accident, something going wrong" , "Blow" , "An accident or unlucky event" .)

I've seen this clue in the Evening Standard.
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