Dry Fe(III)? (6)

I believe the answer is:

ironic

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

'dry' is the definition.
(I know that dry can be written as ironic)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ironic that I've seen before include "Meaning the contrary of what is expressed" , "Dry (of wit)" , "Suggesting the opposite for humorous effect" , "Characterised by mildly sardonic wit" , "Perversely humorous" .)

I've seen this clue in The Independent.

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.