Crossword Genius

Errant Slavs working in the geometrician’s line (11)

Ross

I believe the answer is:

transversal

'the geometrician's line' is the definition.
(transversal line is a type of line in geometry)

'errant slavs working' is the wordplay.
'working' indicates an anagram.
'errant'+'slavs'='errantslavs'
'errantslavs' is an anagram of 'TRANSVERSAL'.

'in' is the link.

(Another definition for transversal that I've seen is " crossing line".)

I've seen this clue in The Times.
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