Prodigal son before getting servile (7)
I believe the answer is:
slavish
'servile' is the definition.
('slavish' can be similar in meaning to 'servile')
'prodigal son before' is the wordplay.
'prodigal' becomes 'lavish' ('lavish' can be similar in meaning to 'prodigal').
'son' becomes 's'.
'before' says to put letters next to each other.
'lavish' after 's' is 'SLAVISH'.
'getting' acts as a link.
(Other definitions for slavish that I've seen before include "Submissive, servile" , "Obsequious" , "that's hardly original" , "fawning" , "Humble" .)