Couple caught out Bank of Scotland (4)
I believe the answer is:
brae
'bank of scotland' is the definition.
(Scottish term for a bank or hillside)
'couple caught out' is the wordplay.
'couple' becomes 'brace' (brace can mean a pair of something).
'caught' becomes 'c' (cricket abbreviation).
'out' is a deletion indicator.
'brace' with 'c' removed is 'BRAE'.
(Other definitions for brae that I've seen before include "Upland area in Scotland" , "Bare on Scottish hillside" , "Bank of Scotland" , "Scots bank or hillside" , "Scottish hill slope" .)