Clasp a small amount of cash, extremely little (6)
I believe the answer is:
buckle
'clasp' is the definition.
(I know that buckle can be written as buckle)
'a small amount of cash extremely little' is the wordplay.
'a small amount of cash' becomes 'buck' (slang term for a dollar).
'extremely' suggests removing the centre (only the extremes of the word are used).
'little' with its centre removed is 'le'.
'buck'+'le'='BUCKLE'
(Other definitions for buckle that I've seen before include "It's attached to a belt or shoe" , "Crumple under pressure, or belt fastener" , "Collapse under pressure" , "Shoe or belt fastening" , "Bend - warp" .)