Unable to use the slot 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 can't explain the rest of the clue.

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

I've seen this clue in the Evening Standard.

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