Small fruit — pointed one (5)
I believe the answer is:
spear
'pointed one' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'small fruit' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'fruit' becomes 'pear' (pear is a kind of fruit).
's'+'pear'='SPEAR'
Can you help me to learn more?
(Other definitions for spear that I've seen before include "Pole with pointed end" , "Spike" , "asparagus for example" , "mint may be added" , "Javelin or harpoon" .)