Dressed in shirt, I get running with this! (8)
I believe the answer is:
rhinitis
'running with this' is the definition.
(rhinitis causes a runny nose)
'dressed in shirt i' is the wordplay.
'dressed' indicates an anagram ('dress' can mean 'prepare').
'in'+'shirt'+'i'='inshirti'
'inshirti' anagrammed gives 'RHINITIS'.
'get' acts as a link.
(Other definitions for rhinitis that I've seen before include "Medical complaint" , "Inflammation of the lining of the nose" , "trouble with the beak" , "I hint, sir, about a nose inflammation" , "nasal affliction" .)