Piece of wit like a ray of sunshine? (5)
I believe the answer is:
shaft
This clue could be a double definition.
'piece of wit' is the first definition.
'shaft' can be an answer for 'piece' (shaft is a kind of piece). I am not certain of the 'of wit' bit.
'ray of sunshine?' is the second definition.
'shaft' can be an answer for 'ray' (synonyms). I am unsure of the 'of sunshine?' bit.
'like a' is the link.
Can you help me to learn more?
(Other definitions for shaft that I've seen before include "Ray; access hole to a mine" , "Stem, handle; (light) ray" , "Body of an arrow" , "Mine access; handle" , "fleece" .)