In line for a rise (8)
I believe the answer is:
increase
'a rise' is the definition.
(thesaurus)
'in line' is the wordplay.
'line' becomes 'crease' ('crease' can be a synonym of 'line'**).
'in'+'crease'='INCREASE'
'for' is the link.
(Other definitions for increase that I've seen before include "Addition, growth" , "Multiply" , "Become greater in size" , "Add, make bigger" , "Get bigger" .)