A complex maths problem that's breathtaking? (6)

I believe the answer is:

asthma

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

'problem that's breathtaking?' is the definition.
I can't tell whether this defines the answer.

'a complex maths' is the wordplay.
'complex' indicates anagramming the letters.
'maths' anagrammed gives 'sthma'.
'a'+'sthma'='ASTHMA'

Can you help me to learn more?

(Other definitions for asthma that I've seen before include "Bronchial allergy" , "Chronic breathing condition" , "Cause of breathing difficulty" , "Common breathing ailment" , "Breathing complaint" .)

I've seen this clue in The Daily Mail.

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