Fissure in rock (7)
I believe the answer is:
crevice
(Other definitions for crevice that I've seen before include "Cleft, fissure" , "Narrow rock fissure" , "Split" , "Crack or fissure." , "Narrow crack" .)
I believe the answer is:
crevice
(Other definitions for crevice that I've seen before include "Cleft, fissure" , "Narrow rock fissure" , "Split" , "Crack or fissure." , "Narrow crack" .)