Exhausted student tackling new bit of maths (8)

I believe the answer is:

consumed

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

'exhausted' is the definition.
(similar in meaning)

'student tackling new bit of maths' is the wordplay.
'student' becomes 'co ed' (co-ed is a kind of student).
'tackling' indicates putting letters inside (to tackle is to take possession of).
'new' becomes 'n' (abbreviation as in New Testament NT).
'bit of maths' becomes 'sum' (I can't explain this - if you can you should give a lot more credence to this answer).
'n'+'sum'='nsum'
'coed' placed around 'nsum' is 'CONSUMED'.

Can you help me to learn more?

(Other definitions for consumed that I've seen before include "squandered" , "Ate" .)

I've seen this clue in The Independent.

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.