Crossword Genius

Sink that's enclosed by newsagent (3)

Ross

I believe the answer is:

sag

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

'sink' is the definition.
(I know that sag is a more specific form of sink)

'enclosed by newsagent' is the wordplay.
'SAG' is hidden in amongst the letters.
However, I'm unsure how the hidden word is indicated.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for sag that I've seen before include "Sinking" , "Fail to retain interest" , "Subsidence" , "Decline" , "Sink (under load)" .)

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