Blocked, fail to break record (6)
I believe the answer is:
closed
'blocked' is the definition.
(similar in meaning)
'fail to break record' is the wordplay.
'fail' becomes 'lose' (I've seen this in other clues).
'to break' is an insertion indicator (inserted letters break into the word).
'record' becomes 'CD' (compact disc).
'lose' inserted into 'cd' is 'CLOSED'.
(Other definitions for closed that I've seen before include "Concluded or fastened" , "Shut" , "restricted" , "Resolved" , "Not longer open" .)