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4d...Get older kind of contract, a factor in Scotland
A?E?T...AGENT ? I presume an agent is known as a factor in Scotland ?

Also 1a...Ends from what you hear in revolutionary act...
T?R?...TYRE ?

4a Agent
age : get older
NT no trumps in Contract bridge
(chrisE confirmed this answer earlier)

I have put AGENT for 4d, but I am not sure why.
Try TURN for a revolutionary act

1a turn

last letters of "what you hear in"

Thanks everybody !