One unoccupied snug oddly ignored by indulgers (5)

I believe the answer is:

idler

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

'oddly ignored by indulgers' is the definition.
I can't judge whether this defines the answer.

'one unoccupied snug' is the wordplay.
'one unoccupied' becomes 'idle' (I've seen this before).
'snug' becomes 'r' (I can't justify this - if you can you should believe this answer much more).
'idle'+'r'='IDLER'

Can you help me to learn more?

(Other definitions for idler that I've seen before include "One who doesn't want to work" , "bad worker" , "One resting" , "Bum" , "Layabout; ship crewman not on watch" .)

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.