Literary heart beats finally in resonating sound (5)
I believe the answer is:
bosom
'literary heart' is the definition.
'bosom' can be an answer for 'heart' (bosom can figuratively mean the heart). I'm not sure about the 'literary' bit.
'beats finally in resonating sound' is the wordplay.
'finally' indicates one should take the final letters.
'in' means one lot of letters goes inside another.
'resonating sound' becomes 'boom' (booming is a kind of sounding. I am not sure about the 'resonating' bit.).
The final letter of 'beats' is 's'.
's' going within 'boom' is 'BOSOM'.
Can you help me to learn more?
(Other definitions for bosom that I've seen before include "A close affectionate and protective acceptance" , "Female breasts" , "heart of family" , "Chest; very close (friend)" , "(Female's) chest" .)