Singer engaged in nepotism (4)
I believe the answer is:
otis
'singer' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'engaged in nepotism' is the wordplay.
'engaged in' indicates the answer is hidden within the clue.
'OTIS' can be found hidden inside 'nepotism'.
Can you help me to learn more?
(Other definitions for otis that I've seen before include "Place of worship; side part of head" , "Cole Porter's miss who was "unable to lunch today"" , "US inventor" , "Regretful miss" , "Miss -- Regrets, Cole Porter song" .)