Irregularly run article on my old pants (8)

I believe the answer is:

randomly

I'm a little stuck... Click here to teach me more about this clue!

'irregularly' is the definition.
(thesaurus)

'run article on my old pants' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'article on' becomes 'an' (indefinite article. I am not sure about the 'on' bit.**).
'pants' indicates an anagram (UK informal term for 'nonsense' or 'rubbish').
'my'+'old'='myold'
'myold' anagrammed gives 'domly'.
'r'+'an'+'domly'='RANDOMLY'

Can you help me to learn more?

(Other definitions for randomly that I've seen before include "In arbitrary order" , "Haphazardly" , "Without order" , "In haphazard manner" , "unmethodically" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app