One who sings the praises of another (8)
I believe the answer is:
eulogist
'one who sings the praises of another' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for eulogist that I've seen before include "One praising another" , "One who extols another" , "good speaker" , "One who sings the praises of another" , "One giving high praise" .)