Perfect tribute son left (4)
I believe the answer is:
toat
'perfect' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'tribute son left' is the wordplay.
'tribute' becomes 'toast' (I've seen this before).
'son' becomes 's' (genealogical abbreviation for son).
'left' suggests deleting specific letters (some letters have left).
'toast' with 's' removed is 'TOAT'.
Can you help me to learn more?
(Another definition for toat that I've seen is " spot-on".)