If the clamp isn't clocked for direct access with a screwdriver, nut driver, or similar, but you can get it partially loose, and the clamp is "attached" to the hose. Then you can usually put a screwdriver under the loosened area of the clamp to further break it loose from the hose, so you can continue to place it so it can be removed.
With the wire clamp, it probably has less tension against the hose than a worm-drive clamp might. If you can wiggle the hose/clamp to turn it, that's half the battle so that with the other end of the hose loose, you can rotate the whole hose to get at the clamp better.
With clamps removed, best to try to rotate the hose to break it loose. Using a flat screwdriver to push it outward from the firewall can sometimes, work too, if there's enough space for the correct tool to do it.
Otherwise, just slit the hose with a sharp knife blade to remove it. At which time a flat blade screwdriver might be needed to widen the slit.
To me, better ways to get there than fender well removal, except when necessary (thinking Fuselage Cars rather than Slabs). Sometimes, thinking like a dealership flat rate mechanic can be beneficial to expediting repairs. Time = money, even if it's your own. Additionally, for us, time can equal stress relief, as we re-focus on something we like.
CBODY67