A lot possibly said for a king (5)
I believe the answer is:
midas
'a king' is the definition.
(mythical king)
'a lot possibly said' is the wordplay.
'a lot' becomes 'm' ().
'possibly' is an anagram indicator.
'said' anagrammed gives 'idas'.
'm'+'idas'='MIDAS'
'for' is the link.
(Other definitions for midas that I've seen before include "One with a golden touch" , "Greek mythological king with money-making touch" , "my gift turned out a curse" , "Legendary king whose touch turned things to gold" , "Mythical king with golden touch" .)