Crossword Genius

Soldier on the go? (6)

Ross

I believe the answer is:

sentry

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'soldier on the go?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'soldier on the go?' is the wordplay.
'soldier' becomes 'sen' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' means one lot of letters go next to another.
'the go?' becomes 'try' (both can mean an attempt).
'sen'+'try'='SENTRY'

Can you help me to learn more?

(Other definitions for sentry that I've seen before include "Guard on watch" , "Picket" , "Lookout person" , "Military lookout" , "One keeps watch" .)

I've seen this clue in the Evening Standard.
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