Time to welcome leading Zionist, a Hebrew prophet (4)
I believe the answer is:
ezra
'a hebrew prophet' is the definition.
(I've seen this in another clue)
'time to welcome leading zionist' is the wordplay.
'time' becomes 'era' (era is a kind of time).
'to welcome' means one lot of letters goes inside another (in sense of 'inviting in').
'leading' suggests taking the first letters.
The initial letter of 'zionist' is 'z'.
'era' placed around 'z' is 'EZRA'.
(Other definitions for ezra that I've seen before include "Old Testament book and priest" , "Eponymous scribe of the Old Testament" , "... Pound, American poet who lived in Italy" , "High priest" , "Old Testament book - American poet Pound" .)