2 down
Secures
in
carriage,
sandwiched
between
twin
sons
(6)
Secures in carriage, sandwiched between twin sons (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Secures, meaning fastens or binds tightly. You've got TRAP (a type of carriage) sandwiched between two S's (twin sons, since S is the abbreviation for son), giving you S-TRAP-S.