Green’s Dictionary of Slang

a problem, a difficult situation; thus personified as a man or woman who acts in a stupid or naïve fashion; sometimes abbr. as Harve.

1932		‘P.P.’ Rhy. Sl. 11: Pickle – Harvey Nichol. Keep yer ‘German’ off my ‘sky’ or you’ll find yerself in a ‘Harvey’.
1960		J. Franklyn Dict. of Rhy. Sl.
1971		J. Jones Rhy. Cockney Sl.