Ten dimes laid out as deposit (8)
I believe the answer is:
sediment
'deposit' is the definition.
(I know that sediment is a more specific form of the action deposit)
'ten dimes laid out' is the wordplay.
'laid out' indicates anagramming the letters.
'ten'+'dimes'='tendimes'
'tendimes' anagrammed gives 'SEDIMENT'.
'as' acts as a link.
(Other definitions for sediment that I've seen before include "Residue" , "Matter settling out in liquid" , "Silt" , "Matter settling out in fluids" , "Deposit at the bottom of a liquid" .)