Having trust, priest interrupts tirade ... (7)
I believe the answer is:
reliant
'having trust' is the definition.
I can't tell whether this defines the answer.
'priest interrupts tirade' is the wordplay.
'priest' becomes 'eli' (biblical figure).
'interrupts' indicates putting letters inside.
'tirade' becomes 'rant' (both can mean an angry outburst).
'eli' placed within '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" .)