Zoom call only half about head of state (6)
I believe the answer is:
career
'zoom' is the definition.
(thesaurus)
'call only half about head of state' is the wordplay.
'only half' indicates taking half.
'about' becomes 're' (regarding).
'head of state' becomes 'ER' (abbreviation for Elizabeth Regina, the Queen).
'call' halved is 'ca'.
'ca'+'re'+'er'='CAREER'
(Other definitions for career that I've seen before include "Progress through work" , "Rush madly" , "Lifetime's work" , "Employment history" , "Business course through life" .)