Having trust, priest interrupts tirade ... (7)
I believe the answer is:
reliant
'having trust' is the definition.
I can't judge whether this defines the answer.
'priest interrupts tirade' is the wordplay.
'priest' becomes 'eli' (biblical figure).
'interrupts' means one lot of letters goes inside another.
'tirade' becomes 'rant' (both can mean an angry outburst).
'eli' inserted inside 'rant' is 'RELIANT'.
Can you help me to learn more?
(Other definitions for reliant that I've seen before include "Robin was one < in need of support" , "Dependent - latrine (anag)" , "leaning" , "Depending (on something)" , "needing help from others" .)