Someone acting as priest casting stone in short tirade? (10)

'someone' is the definition.
(ministrant is a kind of someone)

'stone in short tirade?' is the wordplay.
'stone' becomes 'st' (abbreviation).
'in' means one lot of letters goes inside another.
'short' becomes 'mini' (similar in meaning).
'tirade?' becomes 'rant' (both can mean an angry outburst).
'mini'+'rant'='minirant'
'st' put inside 'minirant' is 'MINISTRANT'.

'acting as priest casting' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?