A single broadcast recalled in the past (3-4)
I believe the answer is:
one-time
'past' is the definition.
Both the answer and definition are adjectives.
Perhaps there's an association between them I don't understand?
'a single broadcast recalled in' is the wordplay.
'a single' becomes 'one' (a single thing - only one).
'broadcast' becomes 'emit' (to emit is to broadcast or give out).
'recalled in' shows that the letters should be reversed in order (letters recalled or sent back).
'emit' reversed gives 'time'.
'one'+'time'='ONE-TIME'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for one-time that I've seen before include "Relating to a single occasion" , "Former" .)