A STAFF member of Tasmanian Premier Paul Lennon has backed claims by the Greens that Mr Lennon's office is using taxpayers' money to operate a dirt unit.

The anonymous member of the Premier's staff also said that Government Senate leader, Michael Aird, was one of half a dozen people digging dirt on political rivals for public dissemination.

Mr Lennon's chief of staff Rod Scott has been accused of writing an anonymous smear document sent to media outlets as part of an attack on the Greens.

Greens MHA Nick McKim said the document was faxed anonymously to several media outlets earlier this week.

A quick check of the file's electronic signature in Microsoft Word showed it was last saved by "rscott", Mr McKim said.

Mr Aird yesterday confirmed Mr Lennon's office was behind the information, but insisted there was no dirt unit.

But today, one of Mr Lennon's staff members, who wished to remain anonymous, said on the ABC that Mr Aird was one of half a dozen people who "dig dirt for the Premier's chief of staff to disseminate anonymously or otherwise".