School grub, perhaps, for a young beginner (5)
I believe the answer is:
rugby
'school' is the definition.
(I've seen this before)
'grub perhaps for a young beginner' is the wordplay.
'perhaps' indicates an anagram.
'for' says to put letters next to each other.
'beginner' indicates taking the first letters.
The first letter of 'young' is 'y'.
'grub' anagrammed gives 'rugb'.
'rugb'+'y'='RUGBY'
(Other definitions for rugby that I've seen before include "Famous public school" , "English city; game" , "Game; town" , "Team sport" , "Type of football; school" .)