25 across
Communication
network
to
estimate
when
metal
gets
twisted
(8)
Communication network to estimate when metal gets twisted (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Communication, giving us LANGUAGE. The wordplay builds it as follows: LAN is a "network" (Local Area Network), and GAUGE means "to estimate". Within GAUGE, the letters AU (gold, a metal) get "twisted" — that is, rearranged to UA — turning GAUGE into GUAGE. Put LAN together with GUAGE and you get LANGUAGE.