Drum almost filled with a fruit (6)
I believe the answer is:
tomato
'fruit' is the definition.
(type of fruit)
'drum almost filled with a' is the wordplay.
'drum' becomes 'tom' (short for tom-tom).
'almost filled' becomes 'to' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' says to put letters next to each other.
'to' put after 'a' is 'ato'.
'tom'+'ato'='TOMATO'
Can you help me to learn more?
(Other definitions for tomato that I've seen before include "Type of sauce" , "Part of a BLT sandwich" , "that's suitable to eat" , "Fruit, often used as vegetable" , "A motto, strangely, for this fruit" .)