Study the accepted behaviour to fit in with the others (7)
I believe the answer is:
conform
'the others' is the definition.
I can't judge whether this definition defines the answer.
'study the accepted behaviour to fit in' is the wordplay.
'study' becomes 'con' (con can mean to study).
'the accepted behaviour' becomes 'm' (I can't explain this - if you can you should believe this answer much more).
'to' becomes 'for'.
'fit in' is an insertion indicator.
'con'+'m'='conm'
'conm' placed around 'for' is 'CONFORM'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for conform that I've seen before include "Toe the line" , "Agree" , "Follow the crowd" , "Run with the pack" , "become fitter?" .)