Crossword Genius

Speech from traitor in Old English (5)

Ross

I believe the answer is:

orate

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'speech from' is the definition.
I can't judge whether this definition defines the answer.

'traitor in old english' is the wordplay.
'traitor' becomes 'rat' (rat can mean a treacherous person).
'in' means one lot of letters goes inside another.
'old english' becomes 'OE'.
'rat' put within 'oe' is 'ORATE'.

Can you help me to learn more?

(Other definitions for orate that I've seen before include "Speak formally" , "Harangue" , "Make a formal speech" , "Speak in public" , "Spout" .)

I've seen this clue in The Sun.
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