Every other change had new lines (9)
I believe the answer is:
alternate
'every other' is the definition.
(synonyms)
'change had new lines' is the wordplay.
'change' becomes 'alter' (synonyms).
'had' says to put letters next to each other.
'new lines' becomes 'nate' (I can't explain this - if you can you should believe this answer much more).
'alter'+'nate'='ALTERNATE'
Can you help me to learn more?
(Other definitions for alternate that I've seen before include "Act reciprocally" , "Occurring in turn repeatedly" , "In turns, first one then the other" , "Happening or following in turns, one after the other" , "Go in turns" .)