Total bill for tree (5)
I believe the answer is:
sumac
'for tree' is the definition.
(I've seen this before)
'total bill' is the wordplay.
'total' becomes 'sum' (synonyms).
'bill' becomes 'ac' (short for account).
'sum'+'ac'='SUMAC'
(Other definitions for sumac that I've seen before include "Shrub bright in autumn" , "Spice" , "Tree colourful in autumn" , "Hairy-fruited rhus" , "Small tree bright in autumn" .)