A shade late when disorganised (4)
I believe the answer is:
teal
'a shade' is the definition.
(I know that teal is a type of green)
'late when disorganised' is the wordplay.
'when disorganised' indicates an anagram.
'late' anagrammed gives 'TEAL'.
(Other definitions for teal that I've seen before include "Type of duck" , "Duck; greenish-blue colour" , "Small river duck" , "Bluish shade of green" , "Variety of duck" .)