A balsam left out untidily (4)

I believe the answer is:

tolu

'a balsam' is the definition.
(tolu balsam is a kind of balsam)

'left out untidily' is the wordplay.
'left' becomes 'L' (common abbreviation).
'untidily' is an anagram indicator (I've seen this in other clues).
'l'+'out'='lout'
'lout' anagrammed gives 'TOLU'.

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.