Regarding child’s play (like Matilda, perhaps) by finales (4)
I believe the answer is:
'regarding child's play' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'like matilda perhaps by finales' is the wordplay.
'finales' indicates one should take the final letters (I've seen 'finale' mean this).
The final letters of 'like matilda perhaps by' are 'EASY'.
Can you help me to learn more?
(Other definitions for easy that I've seen before include "in plentiful supply" , "Gentle - light" , "Simply achieved" , "Obliging; go carefully" , "Frederick Marryat's midshipman" .)