I learned an unusual response to stress (10)

I believe the answer is:

adrenaline

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

'response to stress' is the definition.
I can't tell whether this definition defines the answer.

'i learned an unusual' is the wordplay.
'unusual' indicates an anagram.
'i'+'learned'+'an'='ilearnedan'
'ilearnedan' with letters rearranged gives 'ADRENALINE'.

Can you help me to learn more?

(Other definitions for adrenaline that I've seen before include "Hormone replacement" , "Stimulating hormone" , "It stimulates" .)

I've seen this clue in The Times.

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