He can cook a bit of lunch, effectively (4)
I believe the answer is:
chef
'he can cook a bit' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'of lunch effectively' is the wordplay.
'of' indicates the answer is hidden within the clue.
'CHEF' is hidden within 'lunch effectively'.
Can you help me to learn more?
(Other definitions for chef that I've seen before include "Hotel cook" , "Chief male cook in restaurant" , "member of kitchen staff" , "Originator of courses" , "Principal cook" .)