What does the cryptic crossword clue "Simple question number one hitting you on the head (2-7)" mean?

The definition is "head". The wordplay uses a charade (building blocks). NO (synonym="number") + BRAINER (synonym="one hitting you on the head") = NOBRAINER; definition: "Simple question" The answer is NOBRAINER.

Simple question number one hitting you on the head (2-7)

Guardian Cryptic #28256 | 17 Down | 2020-10-05 flower

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