Green’s Dictionary of Slang

clinking adv.

also hell-clinking

a general positive intensifier, very, extremely; often as clinking good and often of a racehorse.

[UK]Daily Tel. 6 June n.p.: Vermouth was a clinking good horse [F&H].
[UK] Sporting Times 8 Feb. 3/3: Marseille, barring its odours, is a clinking good town—broad street, avenues of trees, and cafes everywhere.
[UK]Boy’s Own Paper 15 Apr. 450: What a clinking little place, what pretty flowers, so homely too!
[UK]A. Binstead Pitcher in Paradise 36: This mare’s been a-puttin’ in some clinkin’ fine work.
[NZ]Otago Witness 4 Mar. 90/2: Skirmisher was a clinking good colt.
[NZ]N.Z. Truth 15 June 3/3: A clinking good North v South match would be the means of convincing the unbelivers.
[UK]E. Pugh Harry The Cockney 160: Clinking fine song!
[US]Van Loan ‘The Redemption Handicap’ in Old Man Curry 183: If this here Bismillah is such a hell-clinkin’ good race horse, how come they ain’t all bettin’ on him?