Throw a Parisian laid by rocky shore (7)

I believe the answer is:

unhorse

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'throw' is the definition.
(thesaurus)

'a parisian laid by rocky shore' is the wordplay.
'a parisian' becomes 'un'.
'laid by rocky shore' becomes 'horse' (I can't explain this - if you can you should give a lot more credence to this answer).
'un'+'horse'='UNHORSE'

Can you help me to learn more?

(Other definitions for unhorse that I've seen before include "Overthrow" , "Unship rider" , "Throw" .)

I've seen this clue in The Telegraph.

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