Headless spear with a tapering shape (4)

I believe the answer is:

pear

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'a tapering shape' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'headless spear' is the wordplay.
'headless' means to remove the first letter.
'spear' with its first letter taken away is 'PEAR'.

'with' is the link.

Can you help me to learn more?

(Other definitions for pear that I've seen before include "Alternative to apple" , "Fruit related to apple" , "Tasty fruit that tapers towards the stalk" , "Fruit (maybe Conference?)" , "Fruit tree" .)

I've seen this clue in the Evening Standard.

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