Nook (6)
'nook' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for alcove that I've seen before include "Recessed part of a room" , "compartment" , "Recess in a small room or wall" , "Small opening - a clove (anag)" , "Small opening off a larger room" .)
(Other definitions for cranny that I've seen before include "Crevice as hiding place" , "Secret place (searched after nook)" , "Small narrow opening" , "corner" , "Small rock fissure" .)