Form of rise appropriate for the remainder (7)
I believe the answer is:
residue
'the remainder' is the definition.
('residue' can be a synonym of 'remainder')
'form of rise appropriate' is the wordplay.
'form of' indicates anagramming the letters (the letters need to be in another 'form').
'appropriate' becomes 'due' ('due' can be similar in meaning to 'appropriate').
'rise' is an anagram of 'resi'.
'resi'+'due'='RESIDUE'
'for' acts as a link.
(Other definitions for residue that I've seen before include "Dire use of the remainder" , "Part remaining" , "What's left" , "Something remaining" , "Dire use of what is left over" .)