What NDAppy said.
No, seriously. My bay is going that funny mushroom colour at the moment. In the middle of clipping. Although I strongly suspect he may be brown, his muzzle is much lighter than the rest of his coat in the winter.
I do think your fellow looks clipped, OP. That's a pretty standard colour for them to go when you clip them. Some bays go mushroom, some go pale gold, still others go orange. My bay went pale when I clipped him in the winter and, in the middle of a tidy-up practice clip, he is now going mushroom in the summer! (he is bright red-bay and he lives on darkening feeds; I did make a change - added sunflower seeds - but some horses just go a different colour every clip)
My buckskin went white in her pale areas and paler in her dark areas. Mum's palomino goes white. Every chestnut I ever saw goes orange OR a really ugly silvery colour. And I have seen blacks clipped, they go a kind of dark grey or they go mushroom. Only greys stay the same colour when you clip them.