Crossword Genius

Stick next to low tree (4,3)

Ross

I believe the answer is:

blue gum

'tree' is the definition.
(blue gum is a kind of tree)

'stick next to low' is the wordplay.
'stick' becomes 'gum' (I've seen this before).
'next to' says to put letters next to each other.
'low' becomes 'blue' (both can mean unhappy).
'gum' put after 'blue' is 'BLUE GUM'.

I've seen this clue in The Guardian.
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