Crossword Genius

Stiffening used for charts? (6)

Ross

I believe the answer is:

starch

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

'stiffening' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'for charts?' is the wordplay.
'charts' anagrams to 'STARCH'.
But, I am not sure how the anagram is indicated.

'used' is the link.

Can you help me to learn more?

(Other definitions for starch that I've seen before include "Carbohydrate found in potatoes, wheat etc." , "Stuff that stiffens, say collars" , "Reserve" , "Carbohydrate that occurs in all green plants" , "Potato, rice constituent; a stiffener" .)

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