Ridge on rocks overlooked (7)
I believe the answer is:
ignored
'overlooked' is the definition.
(I've seen this before)
'ridge on rocks' is the wordplay.
'rocks' is an anagram indicator.
'ridge'+'on'='ridgeon'
'ridgeon' is an anagram of 'IGNORED'.
(Other definitions for ignored that I've seen before include "Neglected" , "Shunned" , "overlooked" , "Snubbed" , "Took no notice of" .)