A right lot of wets reportedly in charge (7)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

A, R (right), then aural wordplay [reportedly] “rain{s}” (wets) [lot of…] / RAIGN. Tricky goings on here which took me ages to spot. The surface reading refers to ‘Wets’ as Conservative politicians with liberal tendencies. I can’t remember now which PM labelled them this, but it may have been Mrs T.