Continued aim is to struggle in opposition (7)
I believe the answer is:
contend
'struggle in opposition' is the definition.
'contend' can be an answer for 'struggle' (I've seen this before). I am unsure of the 'in opposition' bit.
'continued aim' is the wordplay.
'continued' becomes 'cont' (common abbreviation).
'aim' becomes 'end' (both can mean a goal or purpose).
'cont'+'end'='CONTEND'
'is to' acts as a link.
Can you help me to learn more?
(Other definitions for contend that I've seen before include "Engage in a struggle" , "Maintain" , "Struggle; assert" , "fight" , "Struggle in rivalry" .)