One poet or another keeping quiet (4)
I believe the answer is:
pope
'one poet' is the definition.
(Alexander Pope)
'another keeping quiet' is the wordplay.
'another' becomes 'poe' (I can't justify this - if you can you should give a lot more credence to this answer).
'keeping' indicates putting letters inside.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'poe' placed around 'p' is 'POPE'.
'or' is the link.
Can you help me to learn more?
(Other definitions for pope that I've seen before include "English poet, d. 1744" , "Vatican head" , "Bishop of Rome" , "author" , "church leader in Rome" .)