Declare at cricket game (6)
I believe the answer is:
attest
'declare' is the definition.
(I know that attest is a more specific form of the action affirm)
'at cricket game' is the wordplay.
I cannot quite see how this works, but
'at' is found in the answer.
'game' could be 'test' (cricket test match) and 'test' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for attest that I've seen before include "Confirm to be true" , "Act as witness" , "Declare (that something is the case)" , "Give evidence - sounds a trial" , "Provide firm evidence" .)