Gaps (7)
'gaps' is the definition.
(lacuna is a kind of gap)
This is all the clue.
(Another definition for lacunae that I've seen is " Gaps".)
'gaps' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for spaces that I've seen before include "Open areas" , "Blank areas" , "cleared areas" , "Intervals" , "distances" .)