Top lawyer owing banks; very curious (4)
I believe the answer is:
agog
'very curious' is the definition.
(I've seen this before)
'top lawyer owing banks' is the wordplay.
'top lawyer' becomes 'ag' (abbreviation for attorney general).
'banks' suggests removing the centre (the banks are the edges of the word).
'owing' with its centre removed is 'og'.
'ag'+'og'='AGOG'
(Other definitions for agog that I've seen before include "Wide-eyed and fascinated" , "Very eager (in anticipation)" , "Enthralled" , "Excitedly eager" , "Highly excited in anticipation" .)