Rub back with French water from desk (6)
I believe the answer is:
bureau
'desk' is the definition.
(type of writing desk)
'rub back with french water' is the wordplay.
'back' is a reversal indicator.
'with' is a charade indicator (letters next to each other).
'french water' becomes 'eau' ('water' in French).
'rub' in reverse letter order is 'bur'.
'bur'+'eau'='BUREAU'
'from' is the link.
(Other definitions for bureau that I've seen before include "Wtiting desk" , "Office; writing desk" , "Foreign office" , "Government department, agency" , "Ancient chipped flint" .)