See group with judge in despair (4,5)
I believe the answer is:
lose heart
'despair' is the definition.
(both can mean to feel hopeless)
'see group with judge' is the wordplay.
'see' becomes 'lo' (archaic exclamation meaning 'look!').
'group' becomes 'set' (both can mean a collection).
'with' indicates putting letters inside.
'judge' becomes 'hear' (as in to hear a court case).
'set' placed around 'hear' is 'seheart'.
'lo'+'seheart'='LOSE HEART'
'in' is the link.
(Other definitions for lose heart that I've seen before include "Start to despair" , "What patient may do before subsequent transplant" , "Become disillusioned" , "Here's a lot to cause courage to ebb" , "Become dispirited" .)