Friendly to everyone in extremes of poverty (5)
I believe the answer is:
pally
'friendly' is the definition.
(pally means friendly)
'everyone in extremes of poverty' is the wordplay.
'everyone' becomes 'all' (all people).
'in' means one lot of letters goes inside another.
'extremes of' means to remove the middle letters (only the letters at the extremes of the word).
'poverty' with its centre removed is 'py'.
'all' inserted 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" .)