Cold Republican inside observed with partition (6)
I believe the answer is:
screen
'partition' is the definition.
(I know that screen is a type of partition)
'cold republican inside observed' is the wordplay.
'cold' becomes 'c' (eg on taps).
'republican' becomes 'r' (abbreviation).
'inside' is an insertion indicator.
'observed' becomes 'seen' (synonyms).
'c'+'r'='cr'
'cr' going inside 'seen' is 'SCREEN'.
'with' is the link.
(Other definitions for screen that I've seen before include "Surface for projection of pictures" , "Films are projected onto it" , "A film is projected onto it" , "Room divider" , "Conceal or sift" .)