Loser is too organised (4-3)
I believe the answer is:
also-ran
'loser' is the definition.
(I know that loser can be written as also-ran)
'too organised' is the wordplay.
'too' becomes 'also' (synonyms).
'organised' becomes 'ran' (I've seen this before).
'also'+'ran'='ALSO-RAN'
'is' acts as a link.
(Other definitions for also-ran that I've seen before include "Unplaced horse" , "One of the losers" , "Not placed among the leaders" , "Race loser" , "Non-winning racer" .)