Crossword Genius

Angles for, when one writes to (5,1,4)

Ross

I believe the answer is:

drops a line

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'angles' is the definition.
Although both the answer and definition are verbs in their -s form, I don't understand how one could define the other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for drops a line that I've seen is " writes".)

I've seen this clue in the Evening Standard.
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