The most common and most likely answer to this crossword clue is the 8 letter word TETHERED
I've seen this crossword clue in The Guardian
T
E
T
H
E
R
E
D
More clues leading to the result TETHERED
- Tied up Edward around that place
- Website there designs features to be firmly attached
- Going around that place, Edward is tied down
- Tied: one’s left in that place locked up?
- It gives potter one after table ends secured
- Bear traps in place, secured with rope
- Heartless type, the leftie must be restricted
- Thailand’s first king, apparently ill-prepared to leave capital of Laos secured
- Limited the movement of stock
- Edward wraps square present, tied with strong string?
Buddy explains!

The straight part
We know that "secured" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case secured = tethered.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TETHERED mean?
TETHERED verb- To restrict something with a tether.
- To connect a cellular smartphone to another personal computer in order to give it access to a hotspot.
- Tied, strapped, especially with tethers or hobbles.
- Connected (especially a mobile phone to a computer, for use as a wireless modem)