Press one to change message back (8)

I believe the answer is:

response

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

'message back' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'press one to change' is the wordplay.
'to change' indicates anagramming the letters.
'press'+'one'='pressone'
'pressone' is an anagram of 'RESPONSE'.

Can you help me to learn more?

(Other definitions for response that I've seen before include "bid by partner" , "Rejoinder, retort" , "Answer - retort" , "Acknowledgement" , "Preens so by way of answer" .)

I've seen this clue in The Independent.

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.