Friendly to everyone in extremes of poverty (5)
I believe the answer is:
pally
'friendly' is the definition.
('pally' can be similar in meaning to 'friendly')
'everyone in extremes of poverty' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'in' indicates putting letters inside.
'extremes of' suggests removing the centre.
'poverty' with its middle removed is 'py'.
'all' put inside 'py' is 'PALLY'.
'to' is the link.
(Other definitions for pally that I've seen before include "Very familiar" , "Thick" , "Close, friendly" , "Intimate" , "On friendly terms" .)