"WETS was Mrs Thatcher’s description of those on the left wing of the right-leaning Conservative party"

The whole clue is a cryptic definition - think laterally

Break down the clue into definition and wordplay parts

Answer: WETS | Wordplay: Softies on the right left (4)I think this is just a cryptic definition: WETS was Mrs Thatcher’s description of those on the left wing of the right-leaning Conservative party