Crossword Genius

Watch for second coming? (6)

Ross

I believe the answer is:

sentry

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

'watch' is the definition.
(I know that watch can be written as sentry)

'second coming?' is the wordplay.
I cannot really see how this works, but
'second' could be 's' (common abbreviation) and 's' is present in 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...

'for' is the link.

Can you help me to learn more?

(Other definitions for sentry that I've seen before include "Military lookout" , "Watchperson" , "Guard on watch" , "Military guard" , "Person standing watch" .)

I've seen this clue in The Globe and Mail.
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