An Ireland revitalised: it's rousing stuff (9)

I believe the answer is:

adrenalin

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

'rousing stuff' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'an ireland revitalised' is the wordplay.
'revitalised' indicates anagramming the letters.
'an'+'ireland'='anireland'
'anireland' anagrammed gives 'ADRENALIN'.

'it's' is the link.

Can you help me to learn more?

(Other definitions for adrenalin that I've seen before include "Stimulating hormone" , "Hormone that stimulates the nervous system" , "Metabolism-affecting hormone" , "Booster" , "Hormone affecting circulation and breathing" .)

I've seen this clue in The Sun.

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