Modifying integral structure (8)

I believe the answer is:

altering

'modifying' is the definition.
(thesaurus)

'integral structure' is the wordplay.
'structure' indicates anagramming the letters.
'integral' with letters rearranged gives 'ALTERING'.

(Other definitions for altering that I've seen before include "making a change" , "Changing -- 1 across (anag)" , "Making changes" , "Modifying, changing" , "revising" .)

I've seen this clue in The Globe and Mail.

Want a hint initially instead of a full solution? Install my app