Not often (6)
'not often' is the definition.
('rarely' is the opposite to 'often')
This is all the clue.
(Other definitions for rarely that I've seen before include "Seldom, not frequently" , "when hundred-to-one horse wins?" , "Not done or occurring very often" , "once in a blue moon" , "Gas used in fluorescent signs" .)
'not often' is the definition.
('seldom' is the opposite to 'often')
This is all the clue.
(Other definitions for seldom that I've seen before include "Alluvium" , "Not very often, rarely" , "Not 21" , "Once in a blue moon" , "Models (anag)" .)