See old husband in bar finds way out (8)
I believe the answer is:
loophole
'way out' is the definition.
(I've seen this before)
'see old husband in bar' is the wordplay.
'see' becomes 'lo' (archaic exclamation meaning 'look!').
'old' becomes 'o' (abbreviation).
'husband' becomes 'h' (abbreviation).
'in' is an insertion indicator.
'bar' becomes 'pole' ().
'h' placed within 'pole' is 'phole'.
'lo'+'o'+'phole'='LOOPHOLE'
'finds' is the link.
(Other definitions for loophole that I've seen before include "Escape clause" , "Means of evasion" , "Opportunity to evade difficulty" , "A way to evade an obligation" , "Ambiguity (in rules) through which one can avoid punishment" .)