Gossip spread gem's renown (10)
I believe the answer is:
newsmonger
'gossip' is the definition.
(I know that gossip can be written as newsmonger)
'spread gem's renown' is the wordplay.
'spread' indicates an anagram.
'gems'+'renown'='gemsrenown'
'gemsrenown' anagrammed gives 'NEWSMONGER'.
(Other definitions for newsmonger that I've seen before include "Reporter" , "Gossip - Mr Owen's gen (anag)" .)