A children's game run through immediately (2,1,6)
I believe the answer is:
at a glance
'immediately' is the definition.
(I've seen this before)
'a children's game run' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is found in the answer.
'game' could be 'tag' (children's playground game) and 'tag' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'through' is the link.
Can you help me to learn more?
(Other definitions for at a glance that I've seen before include "immediately" , "With just a look" .)