Crossword Genius

Go off riding after shock (4,2)

Ross

I believe the answer is:

blow up

'go off' is the definition.

'riding after shock' is the wordplay.
'riding' becomes 'up' (I've seen this in other clues**).
'after' means one lot of letters go next to another.
'shock' becomes 'blow' ('blow' can be a synonym of 'shock').
'up' after 'blow' is 'BLOW-UP'.

(Other definitions for blow up that I've seen before include "Burst" , "Antonioni film - magnify image" , "Destroy with explosion" , "Enlarge - explode" , "high wind?" .)

I've seen this clue in The Telegraph.
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