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Motorway anger ultimately destroys illusions (7)

Ross

I believe the answer is:

mirages

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

'motorway anger ultimately destroys' is the wordplay.
'motorway' becomes 'mi' (resembles M1, English motorway).
'anger' becomes 'rage' (rage is a kind of anger).
'ultimately' says to take the final letters.
The final letter of 'destroys' is 's'.
'mi'+'rage'+'s'='MIRAGES'

(Another definition for mirages that I've seen is " Optical illusions in hot places".)

I've seen this clue in The Telegraph.
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