Suppress, to remain on good terms with (4,2)
I believe the answer is:
keep in
'suppress' is the definition.
(thesaurus)
'remain on good terms with' is the wordplay.
I cannot quite understand how this works, but
'remain' could be 'keep' (keeping is a kind of remaining) and 'keep' is present in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for keep in that I've seen before include "Conceal" , "Restrain" , "Contain" , "punish a pupil" , "Bottle up - shut up" .)