Breakfast might be so vulnerable! (2,5)
I believe the answer is:
on toast
'so vulnerable' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'breakfast' is the wordplay.
I cannot quite understand how this works, but
'breakfast' could be 'toast' (toast is often eaten as breakfast) and 'toast' is found in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'might be' acts as a link.
Can you help me to learn more?
(Another definition for on toast that I've seen is " See 3".)