Somehow hit dome bone of the skull (7)

I believe the answer is:

ethmoid

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'bone of the skull' is the definition.
The definition suggests a singular noun which matches the answer.

'somehow hit dome' is the wordplay.
'somehow' is an anagram indicator.
'hit'+'dome'='hitdome'
'hitdome' anagrammed gives 'ETHMOID'.

Can you help me to learn more?

(Other definitions for ethmoid that I've seen before include "like a sieve" , "in form of a riddle" .)

I've seen this clue in The Times.

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