Crossword Genius

Headstrong imp quaffed cans (4-6)

Ross

I believe the answer is:

self-willed

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'headstrong' is the definition.
(synonyms)

'imp quaffed cans' is the wordplay.
'imp' becomes 'elf' (synonyms).
'quaffed' becomes 'swilled' (I can't justify this - if you can you should give a lot more credence to this answer).
'cans' means one lot of letters goes inside another (to can could mean to contain).
'elf' going inside 'swilled' is 'SELF-WILLED'.

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