Unloved story about a homeless animal (5)

I believe the answer is:

stray

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

'homeless animal' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stray that I've seen before include "Waif and - -" , "Appearing occasionally" , "Wander; be unfaithful" , "Depart from the right path" , "Lost pet" .)

I've seen this clue in The Daily Express.

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.