Alpha males get the final word (4)
I believe the answer is:
amen
'the final word' is the definition.
(last word in a prayer)
'alpha males' is the wordplay.
'alpha' becomes 'a' (phonetic alphabet: alpha, bravo, charlie etc.).
'males' becomes 'men' (man is a kind of male).
'a'+'men'='AMEN'
'get' is the link.
(Other definitions for amen that I've seen before include "Name for end to prayer" , "Word at the end of a prayer" , "Conclusion of prayer" , "as agreed!" , "Final word in prayer" .)