Crossword Genius

An obligation some people avoid by running! (4)

Ross

I believe the answer is:

duty

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

'an obligation' is the definition.
(I know that obligation can be written as duty)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for duty that I've seen before include "Cancel (a law)" , "Official obligation" , "charge" , "Service - tax - office" , "Tax - burden" .)

I've seen this clue in the Evening Standard.
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.