Overtake father and sons (4)
I believe the answer is:
pass
'overtake' is the definition.
(synonyms)
'father and sons' is the wordplay.
'father' becomes 'pas' (I can't justify this - if you can you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'sons' becomes 's'.
'pas'+'s'='PASS'
(Other definitions for pass that I've seen before include "Approve; mountain route" , "gap" , "while away" , "Graduate, perhaps? A" , "Amatory advance" .)