Dismiss those starting in the building game (3,2)
I believe the answer is:
let go
'dismiss' is the definition.
(I've seen this before)
'those starting in the building game' is the wordplay.
'starting' suggests taking the first letters.
'in the' indicates putting letters inside.
'building game' becomes 'lego' (I can't explain this - if you can you should believe this answer much more).
The initial letter of 'those' is 't'.
't' placed within 'lego' is 'LET GO'.
Can you help me to learn more?
(Other definitions for let go that I've seen before include "Release or permit to depart" , "Release - relax one's grasp" , "Relinquish one's grip" , "Give up" , "Don't hold on" .)