14 across
Assemble
silver
work
unit
around
entrance
(9)
Assemble silver work unit around entrance (9)
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The definition is at the beginning of the clue.
How the clue works
The definition is Assemble — to gather together. For the wordplay, silver gives you AG, then work unit is ERG, which gets turned around (reversed) to give GRE, and entrance hands you GATE. String those three together and you've got your answer.