Live without sex or power (4)
I believe the answer is:
bite
'power' is the definition.
(thesaurus)
'live without sex' is the wordplay.
'live' becomes 'be' ('be' can be a synonym of 'live').
'without' means one lot of letters goes inside another ('without' can be similar in meaning to 'outside').
'sex' becomes 'it' (a common euphemism).
'be' going around 'it' is 'BITE'.
'or' is the link.
(Other definitions for bite that I've seen before include "Puncture by 9 [ADDER]" , "Small amount to eat" , "Clamp down teeth" , "Small amount of food" , "Use one's teeth" .)