Decanter is able to be seen within (3)
I believe the answer is:
can
'able to be seen within' is the definition.
I can't tell whether this defines the answer.
'decanter' is the wordplay.
'CAN' is hidden within the letters.
But, I am not sure how this is indicated.
'is' is the link.
Can you help me to learn more?
(Other definitions for can that I've seen before include "Container (e.g. beer)" , "Tin; be able to" , "Cooler" , "Is able; container" , "May" .)