Singer quite normally entertains (5)
I believe the answer is:
tenor
'singer' is the definition.
(I know that tenor is a type of singer)
'quite normally entertains' is the wordplay.
'entertains' indicates a hidden word (the answer is welcomed or entertained by the clue).
'TENOR' is hidden within 'quite normally'.
(Other definitions for tenor that I've seen before include "General meaning of an utterance" , "Eg, Placido Domingo" , "Vocal part" , "direction" , "Male singing voice of high pitch" .)