Genuine article secured by relative in charge (9)
I believe the answer is:
authentic
'genuine' is the definition.
('authentic' can be similar in meaning to 'genuine')
'article secured by relative in charge' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'secured by' means one lot of letters goes inside another (I've seen this in other clues).
'relative' becomes 'aunt' (aunt is a kind of relative).
'in charge' becomes 'ic'.
'the' put inside 'aunt' is 'authent'.
'authent'+'ic'='AUTHENTIC'
(Other definitions for authentic that I've seen before include "trustworthy" , "Ian, the cut is genuine" , "reliable" , "Real, genuine" , "Bona fide" .)