Strange grit is found in river (6)
I believe the answer is:
tigris
'river' is the definition.
(Tigris River is an example)
'strange grit is' is the wordplay.
'strange' is an anagram indicator.
'grit' is an anagram of 'tigr'.
'tigr'+'is'='TIGRIS'
'found in' is the link.
(Other definitions for tigris that I've seen before include "Major tributary of the Euphrates" , "running water" , "It flows from Turkey to the Persian Gulf" , "Great river of Mesopotamia" , "it runs through Iraq" .)