Sink that's enclosed by newsagent (3)
I believe the answer is:
sag
'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)" .)