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SPOILER Have finished but can't parse 1across. Cave dEPOSIT, old - work on it inside. (10)

Because of all the letters I had inserted already it could only be stalactite, but don't get it. Explanation gratefully accepted.
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Sorry! Just seen it. No need for replies.
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Stale old-work -act and it inside?

Stale - old
Act - work
+ it

Thanks, both. Sorry to have bothered everyone!
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