… about to dispose of film display unit (7)

I believe the answer is:

cabinet

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

'display unit' is the definition.
'cabinet' can be an answer for 'unit' (cabinet is a kind of unit). I'm unsure of the 'display' bit.

'about to dispose of film' is the wordplay.
'about to' becomes 'ca' (I've seen this in other clues).
'dispose of' becomes 'bin'.
'film' becomes 'et'.
'ca'+'bin'+'et'='CABINET'

Can you help me to learn more?

(Other definitions for cabinet that I've seen before include "high-level meeting" , "elected ministers" , "up against the wall?" , "See 18" , "some PMs dislike?" .)

I've seen this clue in The Guardian.

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