[1337biz]

I would just not mention it and re-frame it as a research position or something like that. Just something where you don't have to lie and that describes what you did there.

In my opinion as soon as you need to "explain" your CV things are getting complicated and you are at an disadvantage over those which have no-explanation necessary CVs.

Of cause the opinion is only valid in situations where you have no previously established relationship with the company/people who are involved in the hiring process.