Tot with games right for tot (6)
I believe the answer is:
nipper
'for tot' is the definition.
(thesaurus)
'tot with games right' is the wordplay.
'tot' becomes 'nip' (I've seen this in another clue).
'with' says to put letters next to each other.
'games' becomes 'pe' (abbreviation for Physical Education).
'right' becomes 'r' (common abbreviation).
'nip'+'pe'+'r'='NIPPER'
(Other definitions for nipper that I've seen before include "Young child or lobster's claw" , "Young person (with claws?)" , "Little chap" , "One pinches" , "Crab - young shaver?" .)