Warrior working to keep going (7,2)
I believe the answer is:
soldier on
'keep going' is the definition.
(I've seen this before)
'warrior working' is the wordplay.
'warrior' becomes 'soldier' (I've seen this before).
'working' becomes 'on' (on can mean working or activated).
'soldier'+'on'='SOLDIER ON'
'to' is the link.
(Other definitions for soldier on that I've seen before include "Keep struggling" , "plug away" , "keep going" , "Persevere (colloq.)" , "Don't give up" .)