Consume every portion in stubborn style (6)

I believe the answer is:

devour

I'm a little stuck... Click here to teach me more about this clue!

'consume every portion' is the definition.
'devour' can be an answer for 'consume' (synonyms). I'm unsure of the 'every portion' bit.

'in stubborn style' is the wordplay.
'in' means one lot of letters goes inside another.
'stubborn' becomes 'dour' (similar in meaning).
'style' becomes 'ev' (I can't explain this - if you can you should believe this answer much more).
'dour' placed around 'ev' is 'DEVOUR'.

Can you help me to learn more?

(Other definitions for devour that I've seen before include "Consume greedily" , "Eat (food) quickly" , "Quickly consume" , "Read avidly" , "Eat hungrily and quickly" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.