Unable to use the shot machine – it’s always the same (10)

I believe the answer is:

changeless

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'it's always the same' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for changeless that I've seen before include "same as always" , "Consistent" , "Very steady" .)

I've seen this clue in the Evening Standard.

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