Spear with no head, but pointed at the top (4)
I believe the answer is:
pear
'pointed at the top' is the definition.
I can't judge whether this definition defines the answer.
'spear with no head' is the wordplay.
'with no head' means to remove the first letter.
'spear' with its first letter taken off is 'PEAR'.
'but' is the link.
Can you help me to learn more?
(Other definitions for pear that I've seen before include "Variety of pome" , "Alternative to apple" , "Tasty fruit that tapers towards the stalk" , "Source of cider" , "One fruit sounds like two" .)