Writer was a bit of a goose (5,3)

I believe the answer is:

quill pen

This clue is a double definition.

'writer' is the first definition.
(historical writing implement)

'a bit of a goose' is the second definition.
(goose feathers were often used as quills)

'was' acts as a link.

(Another definition for quill pen that I've seen is " Old writer".)

I've seen this clue in The Guardian.

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