Be more than rendered unconscious by anaesthetic! (9)
I believe the answer is:
outnumber
'be more than' is the definition.
(I've seen this before)
'unconscious by anaesthetic' is the wordplay.
'unconscious' becomes 'out' (similar in meaning).
'by' is a charade indicator (letters next to each other).
'anaesthetic' becomes 'number' (i.e. something that makes things numb).
'out'+'number'='OUTNUMBER'
'rendered' acts as a link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for outnumber that I've seen before include "Exceed in figures" , "Exceed numerically" , "Have more (eg troops) than" , "Be in the majority" , "Be too many for in contest or conflict" .)