Crossword Genius

Second appearance for guard (6)

Ross

I believe the answer is:

sentry

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

'for guard' is the definition.
(sentry is a kind of guard)

'second appearance' is the wordplay.
I cannot quite see how this works, but
'second' could be 's' (common abbreviation) and 's' is found within the answer.
The remaining letters 'entry' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for sentry that I've seen before include "Military guard" , "Mil. guard" , "Watchperson" , "Watchman" , "Sentinel, look-out" .)

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