Leading a 6 count slow underarm turn in waltz/fox/rumba

[dancewithutoo]

Ok seam the matter what I do the women executes  a quick except if its a regular parnter of mine.
At community dance  teacher  taught it in the lesson preceding the dance. I told here just before the dance
that every one seam to to a quick turn and ask her what to do.
Well first dance a foxtrot, knew the women was in the class and of course she did a quick outside turn.

Any ideas how to lead it?  Id like to be able to consistently lead as my teach does a pretty combo that starts with it.