Daily Telegraph

[Tina]

9a. Canine hero runs adventure cartoon (3,3,3) r?n/?i?/t?n. looks like run tin tin but know that can't be right. Many thanks in advance.

[applestraw]

Run Tin Tin. He was a dog cartoon many years ago.

[Mojo-Jo-Jo]

it's Rin-Tin-Tin.

[applestraw]

Sorry not Run - Rin Tin Tin. Computer thought I'd made a mistake!

[frugalfred]

Rin Tin Tin (often billed as Rin-Tin-Tin in the 1920s and 1930s) was the name given to several related German Shepherd dogs featured in fictional stories on film, radio and television

[bibblebub]

if 'in' is missing from the clue then:-

runs in = R IN
adventure cartoon = TINTIN