His praises are sung in the services (8)
I believe the answer is:
psalmist
'his praises are sung in the services' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is all the clue.
Can you help me to learn more?
(Other definitions for psalmist that I've seen before include "King David" , "song-writer" , "David, most likely" , "Writer of sacred songs in Old Testament" , "Writer of sacred songs in O.T." .)