Crossword Genius

Lawyer referring to technology used by half of the senate, could unsettle them (7)

Ross

I believe the answer is:

agitate

I'm a little stuck... Click here to teach me more about this clue!

'half of the senate could unsettle them' is the definition.
I can't judge whether this defines the answer.

'lawyer referring to technology used by' is the wordplay.
I cannot quite understand how this works, but
'technology' could be 'it' (Information Technology) and 'it' is found in the answer.
'by' could be 'at' and 'at' is located in the answer.
The remaining letters 'age' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for agitate that I've seen before include "Upset, stir" , "Disturb or stir up" , "Stir up (trouble?)" , "Make troubled or nervous" , "Stir vigorously" .)

I've seen this clue in The Irish Times.
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