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Point to angle being formed, as protractors do? (8)

Ross

I believe the answer is:

elongate

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'protractors do?' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.

'point to angle being formed' is the wordplay.
'point' becomes 'E' (compass point).
'being formed' indicates an anagram.
'to'+'angle'='toangle'
'toangle' anagrammed gives 'longate'.
'e'+'longate'='ELONGATE'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for elongate that I've seen before include "Widen" , "Drag out" , "Gone late oddly to extend" , "Make longer" , "grow further" .)

I've seen this clue in The Times.
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