A shot from the sentry (3)

I believe the answer is:

try

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

'a shot' is the definition.
(both can mean an attempt)

'the sentry' is the wordplay.
'TRY' is hidden within the letters.
However, I am uncertain how the hidden word is indicated.

'from' is the link.

Can you help me to learn more?

(Other definitions for try that I've seen before include "Four rugby points" , "Go" , "Attempt a score" , "Attempt - hear (legally)" , "crack" .)

I've seen this clue in the Evening Standard.

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