Ash, for example, is found in street (4)
I believe the answer is:
tree
'ash for example' is the definition.
(ash is a kind of tree)
'found in street' is the wordplay.
'found in' indicates a hidden word.
'TREE' is hidden in the letters of 'street'.
'is' is the link.
(Other definitions for tree that I've seen before include "cross" , "- Frog; - house" , "Large shrub; family line" , "Plane or pine, for example?" , "Box, perhaps" .)