Constituent altering constituents, somehow (8)

I believe the answer is:

integral

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

'constituent' is the definition.
(I've seen this before)

'altering constituents somehow' is the wordplay.
'altering' anagrams to 'INTEGRAL'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for integral that I've seen before include "Formed of constituent parts" , "Forming part of the whole" , "Triangle (anag)" , "Relating to being complete" , "using no fractions" .)

I've seen this clue in The Telegraph.

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