A quiet little craving for food (8)
I believe the answer is:
appetite
'craving for food' is the definition.
'appetite' can be an answer for 'craving' (I've seen this in another clue). I am not sure about the 'for food' bit.
'a quiet little' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'little' becomes 'petite' (similar in meaning).
'a'+'p'+'petite'='APPETITE'
Can you help me to learn more?
(Other definitions for appetite that I've seen before include "enthusiasm" , "desire to take courses" , "'Strong desire, craving (8)'" , "Keenness for food" , "demand" .)