A line of searchers (3)

I believe the answer is:

arc

'a line' is the definition.
(arc is a kind of line)

'of searchers' is the wordplay.
'of' says the answer is hidden in the clue.
'ARC' is hidden in the letters of 'searchers'.

(Other definitions for arc that I've seen before include "Part of a curve" , "cut off from the circle" , "Car (anag.)" , "Half-moon" , "Bow" .)

I've seen this clue in the Evening Standard.

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