Come to from anaesthetic? (6)
I believe the answer is:
number
This clue is a double definition.
'come to' is the first definition.
('number' can be a synonym of 'come to')
'anaesthetic?' is the second definition.
(i.e. something that makes things numb)
'from' acts as a link.
(Other definitions for number that I've seen before include "less sensitive" , "Quantity, amount; song" , "issue of magazine" , "27, say" , "Dance" .)