Good entertainer, one who writes for others (5)
I believe the answer is:
ghost
'one who writes for others' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'good entertainer' is the wordplay.
'good' becomes 'g' (abbreviation).
'entertainer' becomes 'host' (person hosting or entertaining guests).
'g'+'host'='GHOST'
Can you help me to learn more?
(Other definitions for ghost that I've seen before include "Visible manifestation of a dead person" , "Writer who gives the credit of authorship to someone else" , "Spirit of the dead" , "Author, secretly" , "21 [WRAITH]" .)