What does the cryptic crossword clue "Thought Head of SIS took drugs (5)" mean?

The definition is "Thought". The wordplay uses acrostic. M (synonym="Head of SIS") + USED (synonym="took drugs") = MUSED; definition: "Thought" The answer is MUSED.

Thought Head of SIS took drugs (5)

Guardian Cryptic #29474 | 13 Down | 2024-08-29 flower

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