Making contents similar (4)
I believe the answer is:
akin
'similar' is the definition.
(similar in meaning)
'making contents' is the wordplay.
'contents' indicates the answer is hidden within the clue (I've seen 'content of' mean this).
'AKIN' can be found hidden inside 'making'.
(Other definitions for akin that I've seen before include "Of like nature or related" , "Seemingly related" , "Close" , "Similar, like" , "Related or similiar" .)