Insect and nothing more, Spooner's said, in drinking vessel (4,3)
I believe the answer is:
beer mug
'drinking vessel' is the definition.
(beer mug is a kind of drinking vessel)
'insect and nothing more spooner's said' is the wordplay.
I cannot quite understand how this works, but
'insect' could be 'bee' (bee is a kind of insect) and 'bee' is found in the answer.
'more' could be 'm' and 'm' is found within the answer.
The remaining letters 'rug' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'in' is the link.
(Other definitions for beer mug that I've seen before include "glass" , "Stein or tankard" , "Drink container" , "drinking vessel" , "Cup for best" .)