A point for a writer (3,3)

I believe the answer is:

pen nib

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'a point' is the definition.
(I know that pen nib is a type of point)

'for a writer' is the wordplay.
'for a' becomes 'pen' (I am not sure about this - if you are sure you should believe this answer much more).
'writer' becomes 'nib' (something which writes).
'pen'+'nib'='PEN-NIB'

Can you help me to learn more?

(Another definition for pen nib that I've seen is " Point of writing instrument".)

I've seen this clue in The Globe and Mail.

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