Financial institution, non-British, to lease jewellery (6)
I believe the answer is:
anklet
'jewellery' is the definition.
(anklet is a kind of jewellery)
'financial institution non-british to lease' is the wordplay.
'financial institution' becomes 'bank' (bank is a kind of financial institution).
'non' indicates named letters should be taken away.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'to lease' becomes 'let' ('let' can be a synonym of 'lease').
'bank' with 'b' removed is 'ank'.
'ank'+'let'='ANKLET'
(Other definitions for anklet that I've seen before include "footwear" , "Fetter" , "Jewellery worn around the bottom of the leg" , "Ornament for lower leg" , "Foot ornament" .)