Crossword Genius

Empty tin can we are consistently failing to open (5)

Ross

I believe the answer is:

inane

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'empty' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for inane that I've seen before include "Stupid and silly" , "Frivolous" , "Without meaning or point" , "Dull-witted" , "Foolish, silly" .)

I've seen this clue in The Times.
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