11 across
One
secures
Milligan
no
trouble
(5-4)
One secures Milligan no trouble (5-4)
-
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is one secures — a spike-nail being a type of fastener. For the wordplay, it's two bits stuck together: Milligan gives you SPIKE (as in the comedian Spike Milligan), then no trouble gives you NAIL (to nail something is to do it without any bother).