Hardly rare? (6)
I believe the answer is:
scarce
This clue is a double definition.
'hardly' is the first definition.
(I know that hardly can be written as scarce)
'rare?' is the second definition.
('scarce' can be similar in meaning to 'rare')
(Other definitions for scarce that I've seen before include "Hardly" , "Rarely seen" , "Uncommon" , "Not often come across" , "Not plentiful, in short supply" .)