Gritty bits one's found at end of street (6)
I believe the answer is:
stones
'gritty bits' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see an association between them that I can't see?
'one's found at end of street' is the wordplay.
I cannot really understand how this works, but
'one's' could be 'ones' and 'ones' is present in the answer.
'street' could be 'st' (abbreviation) and 'st' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for stones that I've seen before include "Cherry pips" , "Small pieces of rock" , "Boulders" , "Gems -- Mick Jagger's rollers?" , "Weights and pieces of rock." .)