Seldom (6)
'seldom' is the definition.
(I know that seldom can be written as rarely)
This is the entire clue.
(Other definitions for rarely that I've seen before include "once in a blue moon" , "Not very often, seldom in fact" , "Hardly ever, most infrequently" , "Very occasionally" , "Seldom, not frequently" .)
'seldom' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rare that I've seen before include "Unusual - exquisite" , "difficult to find?" , "Not found often" , "having few matches?" , "Very lightly cooked, meat say" .)