You end in trouble, accepting everybody's pure (9)
I believe the answer is:
unalloyed
'pure' is the definition.
('unalloyed' can be similar in meaning to 'pure')
'you end in trouble accepting everybody's' is the wordplay.
'in trouble' indicates anagramming the letters.
'accepting' means one lot of letters goes inside another.
'everybody' becomes 'all' (I've seen this before).
'you'+'end'='youend'
'youend' is an anagram of 'unoyed'.
'unoyed' enclosing 'all' is 'UNALLOYED'.
(Other definitions for unalloyed that I've seen before include "Pure, not a blend or mixture" , "Not mixed with another metal" .)