Tree, one that produces small fruits we hear (5)
I believe the answer is:
cedar
'tree' is the definition.
(cedar is a kind of tree)
'one that produces small fruits we hear' is the wordplay.
'one that produces small fruits' becomes 'seeder'.
'we hear' indicates a 'sounds like' (homophone) clue.
'seeder' sounds like 'CEDAR'.
(Other definitions for cedar that I've seen before include "Cypress-like tree" , "Raced around a great hardwood tree" , "representative of Lebanon?" , "Fragrant conifer" , "Raced around noble tree" .)