Claimed to deconstruct mathematical point (7)

I believe the answer is:

decimal

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

'point' is the definition.
(I have seen 'The point' mean 'decimal' so perhaps 'point' could also mean 'decimal')

'claimed to deconstruct mathematical' is the wordplay.
'claimed' can be anagrammed to 'DECIMAL'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for decimal that I've seen before include "Relating to ten" , "Based on the number 10" , "of Number Ten" , "In base ten" , "(System) based on tens" .)

I've seen this clue in The Mirror.

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.