Cat sits in pub, totally blissful (2,6)
I believe the answer is:
in heaven
'pub totally blissful' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'cat sits in' is the wordplay.
I cannot really see how this works, but
'cat' could be 'heave' (heaving is a kind of catting) and 'heave' is located in the answer.
'in' is within the answer.
A single letter 'n' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for in heaven that I've seen is " overjoyed".)