Say priest backed limit (5)
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I believe the answer is:
verge
'limit' is the definition.
(thesaurus)
'say priest backed' is the wordplay.
'say' becomes 'eg' (both can mean for example).
'priest' becomes 'rev' (short for reverend).
'backed' shows that the letters should be reversed in order.
'eg'+'rev'='egrev'
'egrev' written backwards gives 'VERGE'.
(Other definitions for verge that I've seen before include "Grass border along road" , "Margin, edge" , "Grassy road edge" , "Side of road" , "emblem of office for bishop" .)