Crossword Genius

Private, one lacking energy to keep going (7,2)

Ross

I believe the answer is:

soldier on

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'keep going' is the definition.
(I've seen this before)

'private one lacking energy' is the wordplay.
'private' becomes 'soldier' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'lacking' is a deletion indicator.
'energy' becomes 'e' (physics symbol as in E=mco).
'one' with 'e' taken away is 'on'.
'soldier'+'on'='SOLDIER ON'

'to' is the link.

Can you help me to learn more?

(Other definitions for soldier on that I've seen before include "Persevere (colloq.)" , "Persist in spite of difficulties" , "Keep struggling" , "Doggedly continue" , "... to bear up" .)

I've seen this clue in The Telegraph.
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