Again will finally include a method to change the structure (7)
I believe the answer is:
remodel
'change the structure' is the definition.
'remodel' can be an answer for 'change' (remodelling is a kind of changing). I am not certain of the 'the structure' bit.
'again will finally include a method' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'finally' indicates one should take the final letters.
'include' is an insertion indicator.
'a method' becomes 'mode' (I've seen this in another clue).
The final letter of 'will' is 'l'.
're'+'l'='rel'
'rel' placed around 'mode' is 'REMODEL'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for remodel that I've seen before include "Produce new arrangement" , "Alter" , "Make over" , "Change the form of" , "style again" .)