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Gnome mounted horse to cross gorge (7)

Ross

I believe the answer is:

epigram

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'gnome' is the definition.
(thesaurus)

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(Other definitions for epigram that I've seen before include "Gnome" , "it might be natural to wag" , "Short witty remark" , "Bon mot" , "Short, memorable saying" .)

I've seen this clue in The Telegraph.
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