Anxious the exercising may cause great fatigue? (10)

I believe the answer is:

exhaustion

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'great fatigue?' is the definition.
'exhaustion' can be an answer for 'fatigue?' (exhaustion is a kind of fatigue). I'm not certain of the 'great' bit.

'anxious the exercising' is the wordplay.
'exercising' indicates anagramming the letters.
'anxious'+'the'='anxiousthe'
'anxiousthe' is an anagram of 'EXHAUSTION'.

'may cause' is the 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 Times.

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