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Blockbusters initially need directors and something to draw on (10)

Ross

I believe the answer is:

blackboard

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'something to draw on' is the definition.
I can't judge whether this defines the answer.

'blockbusters initially need directors' is the wordplay.
'initially' indicates taking the first letters.
'need' becomes 'lack' (to lack something is to be in need of it).
'directors' becomes 'board' (board of directors).
The first letter of 'blockbusters' is 'b'.
'b'+'lack'+'board'='BLACKBOARD'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for blackboard that I've seen before include "Surface for chalk" , "Teaching aid" , "Traditional teacher's aid" , "something to write on" , "school equipment" .)

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