Game pie has nothing in it (5)
I believe the answer is:
tarot
'it' is the definition.
The definition suggests a singular noun which matches the answer.
'game pie has nothing' is the wordplay.
'game pie' becomes 'tart' (I've seen this in another clue. I am not sure about the 'game' bit.).
'has' indicates putting letters inside.
'nothing' becomes 'O' (O resembles 0).
'tart' going around 'o' is 'TAROT'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for tarot that I've seen before include "78-card pack" , "Method of fortune-telling" , "Fortune-teller's pack of cards" , "Picture card" , "Pack of cards used in fortune-telling" .)