Bogus son given meat (4)
I believe the answer is:
sham
'bogus' is the definition.
(I've seen this in another clue)
'son given meat' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'given' is a charade indicator (letters next to each other).
'meat' becomes 'ham' (ham is a kind of meat).
's'+'ham'='SHAM'
(Other definitions for sham that I've seen before include "Phoney kind of hams" , "Cheap falseness" , "'Fake, pseudo (4)'" , "Pretence, hoax" , "Mash, being counterfeit" .)