Cooperate with others in summons to table (3,5)
I believe the answer is:
get along
'summons to table' is the definition.
I can't tell whether this definition defines the answer.
'cooperate with others in' is the wordplay.
'cooperate' becomes 'gong' (I can't explain this - if you can you should give a lot more credence to this answer).
'with others' becomes 'et al' (short for 'et alia', Latin for 'and others').
'in' is an insertion indicator.
'gong' going around 'etal' is 'GET ALONG'.
Can you help me to learn more?
(Other definitions for get along that I've seen before include "Associate harmoniously" , "Given leave" , "manage to be friendly" , "Have smooth relations or go away" , "Make progress or move on" .)