Solo diner prepared to keep at it (7,2)

I believe the answer is:

soldier on

I'm a little stuck... Click here to teach me more about this clue!

'keep at it' is the definition.
I can't judge whether this definition defines the answer.

'solo diner prepared' is the wordplay.
'prepared' is an anagram indicator.
'solo'+'diner'='solodiner'
'solodiner' with letters rearranged gives 'SOLDIER ON'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for soldier on that I've seen before include "Doggedly continue" , "keep going" , "plug away" , "Persist in spite of difficulties" , "Don't give up" .)

I've seen this clue in The Hindu.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.