The Clement BIDDLES records on Ancestry seem to be the correct one, and Clement Levi Cornock BIDDLES names his mother as Minnie, and he was born in Alvington.

His marriage to Gertrude Ellen BROWN - 19 May 1913, Registry Office in Chepstow

He was in "C" Battery, 348th Brigade, Royal Field Artillery, (Gunner) and looks like he enlisted in Preston.