Staff behind alpha male in capital (5)
I believe the answer is:
amman
'capital' is the definition.
(capital of Jordan)
'staff behind alpha male' is the wordplay.
'staff' becomes 'man' (as in staffing or manning a particular place).
'behind' means one lot of letters go next to another.
'alpha' becomes 'a' (phonetic alphabet: alpha, bravo, charlie etc.).
'male' becomes 'm' (common abbreviation).
'a'+'m'='am'
'man' after 'am' is 'AMMAN'.
'in' is the link.
(Other definitions for amman that I've seen before include "Jordanian capital" , "Asian capital" , "Jordan's capital" , "Middle East capital" , "Jordanian city" .)