Amount added to account? It may bear fruit (5)
I believe the answer is:
sumac
'it may bear fruit' is the definition.
The definition suggests a singular noun which matches the answer.
'amount added to account?' is the wordplay.
'amount' becomes 'sum' (synonyms).
'added to' says to put letters next to each other.
'account?' becomes 'ac' (abbreviation).
'sum'+'ac'='SUMAC'
Can you help me to learn more?
(Other definitions for sumac that I've seen before include "Garden shrub" , "Tree colourful in autumn" , "plant" , "Spice" , "purchase from garden centre?" .)