Child comprehending Arabic form of divination (5)
I believe the answer is:
tarot
'form of divination' is the definition.
The definition suggests a singular noun which matches the answer.
'child comprehending arabic' is the wordplay.
'child' becomes 'tot' (term for a young child).
'comprehending' means one lot of letters goes inside another (comprehend can mean include or contain).
'arabic' becomes 'ar' (abbreviation in Chambers).
'tot' enclosing 'ar' is 'TAROT'.
Can you help me to learn more?
(Other definitions for tarot that I've seen before include "Mystic cards" , "Playing cards" , "These cards are used to tell fortunes" , "Fortune-teller's pack of cards" , "Cards often used in fortune-telling" .)