Extreme fatigue from the anxious preparation (10)

I believe the answer is:

exhaustion

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

'extreme fatigue' is the definition.
'exhaustion' can be an answer for 'fatigue' (exhaustion is a kind of fatigue). I'm unsure of the 'extreme' bit.

'the anxious preparation' is the wordplay.
'preparation' indicates anagramming the letters.
'the'+'anxious'='theanxious'
'theanxious' with letters rearranged gives 'EXHAUSTION'.

'from' acts as a link.

Can you help me to learn more?

(Another definition for exhaustion that I've seen is " fatigue".)

I've seen this clue in The Irish Times.

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