Dismissed after bar collapse (5,3)
I believe the answer is:
flake out
'collapse' is the definition.
The definition and answer can be both related to bodily activities as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
'dismissed after bar' is the wordplay.
'dismissed' becomes 'out' (I've seen this before).
'after' means one lot of letters go next to another.
'bar' becomes 'flake' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'out' put after 'flake' is 'FLAKE OUT'.
Can you help me to learn more?
(Another definition for flake out that I've seen is " Collapse through exhaustion".)