Keep, hold back (6)
I believe the answer is:
retain
I believe this clue is a double definition.
'keep' is the first definition.
(I know that keep can be written as retain)
'hold back' is the second definition.
(I know that hold back can be written as retain)
(Other definitions for retain that I've seen before include "Keep in place" , "Keep in Tirane" , "Not relinquish" , "Hold onto" , "Hold on to or employ counsel" .)