The Crossword Centre Clue-Writing Competition

CCCWC February competition voters’ comments
 
Clue no. 8: Brit regularly mating in series of steps with one extra inserted?

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A clue to BISSEXTILE.
2 comments refer to this clue (from 2 competitors, 0 others)

Here is the text

Comments on the clue
1.I think the definition is a little weak here
2."stile" = series of steps? Sounds laboured.