Correspondent reaction about one volume (10)

I believe the answer is:

responsive

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

'correspondent' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

'reaction about one volume' is the wordplay.
'reaction' becomes 'response' (synonyms).
'about' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'volume' becomes 'v' (abbreviation for volume in book titles).
'i'+'v'='iv'
'response' going around 'iv' is 'RESPONSIVE'.

Can you help me to learn more?

(Another definition for responsive that I've seen is " quick to react".)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.