10 across
I
worked
with
cash
register
she’s
discarded
–
it’s
old
(9)
I worked with cash register she’s discarded – it’s old (9)
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The definition is at the end of the clue.
How the clue works
Right, so "it's old" at the end is your definition — aged, past it, geriatric. For the wordplay, take the letters in "I cash register", then strip out "she's" (that's S, H, E, S going), leaving nine letters. Shuffle those ("worked" is your anagram signal) and they rearrange into GERIATRIC.