Kids’ game to get behind selective diner (4,5)
I believe the answer is:
jack sprat
'selective diner' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'kids' game to get behind' is the wordplay.
'kids' game' becomes 'jacks' (I've seen this in another clue).
'to get' says to put letters next to each other.
'behind' becomes 'prat' (synonyms).
'jacks'+'prat'='JACK SPRAT'
Can you help me to learn more?
(Other definitions for jack sprat that I've seen before include "He ate no fat" , "He ate only lean" , "His wife could eat no lean" , "he stuck to a fat-free diet" , "One leaving fat" .)