Surprising result riding on clot (5)

I believe the answer is:

upset

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

'riding on clot' is the wordplay.
'riding' becomes 'up' (I've seen this in other clues).
'on clot' becomes 'set' (I can't explain this - if you can you should believe this answer much more).
'up'+'set'='UPSET'

Can you help me to learn more?

(Other definitions for upset that I've seen before include "'Disturbed, agitated (5)'" , "Disturb - spoil" , "Put out" , "Disturbed or knocked out of place" , "Overturn, disturb" .)

I've seen this clue in The Telegraph.

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