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

I believe the answer is:

blackboard

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

'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.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.