Celebrated female staff about one display of aplomb (4-5)
I believe the answer is:
sang-froid
'aplomb' is the definition.
(synonyms)
'celebrated female staff about one' is the wordplay.
'celebrated' becomes 'sang' (singing might be done as part of a celebration).
'female' becomes 'f' (common abbreviation).
'staff' becomes 'rod' (both can mean a stick or cane).
'about' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'rod' enclosing 'i' is 'roid'.
'sang'+'f'+'roid'='SANG-FROID'
'display of' acts as a link.
(Other definitions for sang-froid that I've seen before include "Coolness in adversity" , "Aplomb" , "Composure in trying circumstances" , "Composure under strain" , "18-possession" .)