Past love, Tim, originally called around (3-4)
I believe the answer is:
one-time
'past' is the definition.
Both the definition and answer are adjectives.
Maybe you can see a link between them that I don't see?
'love tim originally called around' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'originally called' becomes 'nee' (written before eg a maiden name).
'around' is an insertion indicator.
'tim' inserted into 'nee' is 'netime'.
'o'+'netime'='ONE-TIME'
Can you help me to learn more?
(Other definitions for one-time that I've seen before include "Former" , "Relating to a single occasion" .)