What does the cryptic crossword clue "This shows acid, or tin compounds (9)" mean?

The definition is "This shows". The wordplay uses an anagram. anagram of ACID, + OR + TIN = INDICATOR; definition: "This shows" The answer is Indicator.

This shows acid, or tin compounds (9)

Telegraph Prize Cryptic #3006 | 15 Down | 2019-06-02 flower

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