Dirty newspaper I left filling hotel yard (6)

I believe the answer is:

filthy

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

'dirty' is the definition.
(I know that dirty can be written as filthy)

'newspaper i left filling hotel yard' is the wordplay.
'newspaper' becomes 'FT' (Financial Times newspaper).
'i left' becomes 'il' (this could be a standard abbreviation which I don't know about).
'filling' is an insertion indicator.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'yard' becomes 'y' (abbreviation).
'ft' enclosing 'il' is 'filt'.
'filt'+'h'+'y'='FILTHY'

Can you help me to learn more?

(Other definitions for filthy that I've seen before include "Nasty - smutty" , "Obscene" , "Offensive" , "to be so rich?" , "Really dirty, disgusting" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.