Another heavy weight, individual best (6-2-4)
I believe the answer is:
second to none
'best' is the definition.
(I've seen this before)
'another heavy weight individual' is the wordplay.
'another' becomes 'second'.
'heavy weight' becomes 'ton' (a ton weighs a lot).
'individual' becomes 'one' (an individual is one person).
'second'+'ton'+'one'='SECOND-TO-NONE'
(Other definitions for second to none that I've seen before include "Outstanding" , "Incomparable" , "Pre-eminent" , "Woodwind instrument" , "certain champion" .)