Sketch directors of a draftsman's tool (7-5)

I believe the answer is:

drawing-board

I'm a little stuck... Click here to teach me more about this clue!

'a draftsman's tool' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'sketch directors' is the wordplay.
'sketch' becomes 'drawing' (I've seen this in another clue).
'directors' becomes 'board' (board of directors).
'drawing'+'board'='DRAWING-BOARD'

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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