Wasted header in box leading to draw (6)
I believe the answer is:
blotto
'wasted header' is the definition.
'blotto' can be an answer for 'wasted' (both can mean drunk). I'm not sure about the 'header' bit.
'in box leading to draw' is the wordplay.
'in' indicates putting letters inside.
'leading' suggests taking the first letters.
'draw' becomes 'lot' (synonyms).
The first letter of 'box' is 'b'.
'b'+'to'='bto'
'bto' going around 'lot' is 'BLOTTO'.
Can you help me to learn more?
(Other definitions for blotto that I've seen before include "To bolt away in drunk state" , "Get very drunk" , "Tight" , "Boot Lt. out for being drunk" , "To bolt away slangily drunk" .)