Conceal, then look for, a game (4,3,4)
I believe the answer is:
hide and seek
'a game' is the definition.
(I know that hide-and-seek is a type of child\\u0027s game)
'conceal then look for' is the wordplay.
'conceal' becomes 'hide' (synonyms).
'then' becomes 'and then' (synonyms).
'look for' becomes 'seek' (synonyms).
'hide'+'and'+'seek'='HIDE-AND-SEEK'
(Other definitions for hide and seek that I've seen before include "Game" , "play this?" .)