A suspect has been arrested in connection with his armed robbery of the Clarion Boro 7-11 store.     Clarion Boro Police identify the alledged bandit as (21-year-old) Casey Strawcutter of Clarion.     Strawcutter was apprehended as he was walking near the intersection of South Street and Second Avenue in the boro.     Strawcutter was nabbed there after boro police got information on where the susect might be found.     When Strawcutter was apprehended, by two officers, he was found to be in possession of over a half-dozen knives, one which had  a 13 inch blade.     After getting a search warrant, police looked in Strawcutter's West Main Street apartment and recovered a revolver alledgedly used by him in the holdup.     Strawcutter was arraigned, before a local district justice, on criminal charges of robbery, assault, reckless endangerment and theft.     Strawcutter was lodged in the Clarion CountyPrison, in lieu of 100-Thouand Dollars bond.     The Clarion 7-11 store was held up early on the morning of August Fourth.