Look no more for the best (8)
I believe the answer is:
peerless
'the best' is the definition.
(thesaurus)
'look no more' is the wordplay.
'look' becomes 'peer' (peering is a kind of looking**).
'no more' becomes 'less' (I've seen this in other clues).
'peer'+'less'='PEERLESS'
'for' acts as a link.
(Other definitions for peerless that I've seen before include "Unrivalled" , "Unmatched" , "Outstanding" , "Without equal or match" , "No Iolanthe performance could be so" .)