Fail to penetrate record that’s restricted (6)
I believe the answer is:
closed
'restricted' is the definition.
('closed' can be similar in meaning to 'restricted')
'fail to penetrate record' is the wordplay.
'fail' becomes 'lose' (I've seen this in other clues).
'to penetrate' is an insertion indicator.
'record' becomes 'cd' (I've seen this in other clues).
'lose' going within 'cd' is 'CLOSED'.
'that's' is the link.
(Other definitions for closed that I've seen before include "clinched the sale" , "successfully completed" , "See 1" , "Not longer open" , "Terminated" .)