Crossword Genius

E-tag, as an opening for passage back (4)

Ross

I believe the answer is:

gate

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

'passage back' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'e-tag as an opening' is the wordplay.
'e-tag' anagrams to 'GATE'.
But, I am unsure how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for gate that I've seen before include "Doorway" , "Facility in airport" , "Portal" , "It may be barred" , "Field entrance" .)

I've seen this clue in the Sydney Morning Herald.
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