Stone jar containing nickel (7)
I believe the answer is:
'stone' is the definition.
(I've seen this before)
'jar containing nickel' is the wordplay.
'jar' becomes 'grate' (make unpleasant sound).
'containing' indicates putting letters inside.
'nickel' becomes 'ni' ('Ni' can be a synonym of 'nickel').
'grate' enclosing 'ni' is 'GRANITE'.
(Other definitions for granite that I've seen before include "Coarse-grained igneous rock" , "Tangier (anag.)" , "Resilience; stone" , "Showing great resolution" , "Get rain (anag) - rock" .)