Irish giving support to saint excited reaction (4)
I believe the answer is:
stir
'excited reaction' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'irish giving support to saint' is the wordplay.
'irish' becomes 'IR' (abbreviation).
'giving support to' is a charade indicator (letters next to each other).
'saint' becomes 'st' (abbreviation).
'ir' after 'st' is 'STIR'.
Can you help me to learn more?
(Other definitions for stir that I've seen before include "cooler" , "Wake up - prison" , "A slangy prison - whisk it" , "Arouse; commotion" , "Cause to move in slangy prison" .)