10 across
100
escape
jail
ring
(4)
100 escape jail ring (4)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition is ring, since a link is one of those ring-shaped pieces in a chain. For the wordplay, take CLINK (jail) and let C (100) escape, and you're left with your answer.