Crossword Genius

One making binders correct after failing to open (5)

Ross

I believe the answer is:

roper

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

'one making binders correct after failing to open' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

Can you help me to learn more?

(Other definitions for roper that I've seen before include "decoy" , "horse catcher" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app