And I learn about what increases blood pressure (9)

I believe the answer is:

adrenalin

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

'what increases blood pressure' is the definition.
I can't tell whether this defines the answer.

'and i learn about' is the wordplay.
'about' is an anagram indicator.
'and'+'i'+'learn'='andilearn'
'andilearn' with letters rearranged gives 'ADRENALIN'.

Can you help me to learn more?

(Other definitions for adrenalin that I've seen before include "A secretion" , "Hormone affecting circulation and breathing" , "stimulant" , "Hormone affecting metabolism" , "Hormone secreted in response to fear" .)

I've seen this clue in The Times.

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