There seems to be a double take on the MUSH = Face
If MUSHROOM is the correct answer (and I think that it may well be), I would have preferred a clue like "Face cell fungus" to bring ROOM more into the wordplay.
I was thinking along the same line as you Crofter.It is a poor clue. Many thanks for your time and help I know you are kept busy with the MM competition on a Saturday.Regards.