8 across
Mistake
to
put
‘male’
after
only
matching
gender
observed
at
birth
(8)
Mistake to put ‘male’ after only matching gender observed at birth (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Mistake — a solecism is an error or impropriety. For the wordplay, take sole (only), add cis (matching gender observed at birth), then stick M (male) on the end, just as the clue instructs, and you've got it.