What does the cryptic crossword clue "Do something with current to produce muscle protein (5)" mean?

The definition is "protein". The wordplay uses a charade (building blocks). ACT (synonym="ACT") + IN (synonym="current – basically the same sense as in the previous clue") = ACTIN; definition: "protein" The answer is ACTIN.

Do something with current to produce muscle protein (5)

Guardian Cryptic #29166 | 3 Down | 2023-09-04 flower

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