Tin not closed, colour wasted (5)
I believe the answer is:
tired
'wasted' is the definition.
(similar in meaning)
'tin not closed colour' is the wordplay.
'not closed' means to remove the last letter.
'colour' becomes 'red' (red is a kind of colour).
'tin' with its last letter removed is 'ti'.
'ti'+'red'='TIRED'
(Other definitions for tired that I've seen before include "Worn out" , "Depleted of energy" , "getting bored" , "ready for bed" , "Played out" .)