Crossword Genius

Just the chap for a stirring speech (8)

Ross

I believe the answer is:

agitator

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

'stirring speech' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'just the chap for a' is the wordplay.
I cannot really see how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found in the answer.
'a' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for agitator that I've seen before include "Fomenter of unrest" , "Agent provocateur" , "Rabble-rouser - blender" , "One stirring up (things)" , "Demagogue" .)

I've seen this clue in the Evening Standard.
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