Money paid to secure very good person, one very merry (7)
I believe the answer is:
festive
'merry' is the definition.
(I've seen this before)
'money paid to secure very good person one very' is the wordplay.
'money paid' becomes 'fee'.
'to secure' indicates putting letters inside.
'very good person' becomes 'st' (short for saint).
'one' becomes 'I' (Roman numeral).
'very' becomes 'v' (abbreviation).
'st'+'i'+'v'='stiv'
'fee' going around 'stiv' is 'FESTIVE'.
(Other definitions for festive that I've seen before include "Merry" , "Christmassy" , "Offering fun and gaiety" , "Celebratory, joyful" , "Gay" .)