Nothing supporting meeting, one's very much exposed to criticism (7,4)
I believe the answer is:
sitting duck
'one's very much exposed to criticism' is the definition.
I can't judge whether this definition defines the answer.
'nothing supporting meeting' is the wordplay.
'nothing' becomes 'duck' (I've seen this before).
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'meeting' becomes 'sitting' (sitting is a kind of meeting**).
'duck' put after 'sitting' is 'SITTING DUCK'.
Can you help me to learn more?
(Other definitions for sitting duck that I've seen before include "Wide-open target" , "Unmissable target" , "Easy target" , "Obvious target" , "Potential victim" .)