26 across
Barrier
to
become
weaker
perhaps,
a
likely
result
of
crash
(6)
Barrier to become weaker perhaps, a likely result of crash (6)
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The definition is at the end of the clue.
How the clue works
Look at a likely result of crash at the end — that's your definition. For the wordplay, you're building it up in two parts: DAM meaning barrier, followed by AGE, as in to become weaker perhaps (one does tend to, over time).