Fair one is holding device (9,4)

I believe the answer is:

grappling iron

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

'is holding device' is the definition.
(grappling irons are attached to things)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for grappling iron that I've seen before include "This should give a secure hold" , "Clawed device once used in naval warfare" , "Hooked metal device for seizing an enemy ship" .)

I've seen this clue in The Times.

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.