Struggle on with attitude (4)
I believe the answer is:
view
'attitude' is the definition.
(view is a kind of attitude)
'struggle on with' is the wordplay.
'struggle' becomes 'vie' (I've seen this before).
'on' means one lot of letters go next to another.
'with' becomes 'w' (abbreviation).
'vie'+'w'='VIEW'
(Other definitions for view that I've seen before include "Judge" , "Range or field of vision" , "See" , "Opinion; watch" , "Opinion - vista" .)