Host read out his letters (5)
I believe the answer is:
emcee
'host read out his letters' is the definition.
'emcee' can be an answer for 'host' (emceeing is a kind of hosting). I'm not sure about the 'read out his letters' bit.
'host read out' is the wordplay.
'host' becomes 'mc' (I've seen this in other clues).
'read out' indicates a 'sounds like' (homophone) clue.
'mc' sounds like 'EMCEE'.
Can you help me to learn more?
(Other definitions for emcee that I've seen before include "Compere" , "One presents" , "Formal host" , "Compre" , "Presenter" .)