Stiff stuff from eccentric directors (9)

I believe the answer is:

cardboard

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'stiff stuff' is the definition.
'cardboard' can be an answer for 'stuff' (cardboard is a kind of stuff). I'm not certain of the 'stiff' bit.

'eccentric directors' is the wordplay.
'eccentric' becomes 'card' (card can mean an eccentric person).
'directors' becomes 'board' (board of directors).
'card'+'board'='CARDBOARD'

'from' acts as a link.

Can you help me to learn more?

(Other definitions for cardboard that I've seen before include "stiff material" , "without substance" , "A stiff thick paper" .)

I've seen this clue in The Sun.

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