Unusually social Minister turning up outside, one given to speechifying? (9)

'one given to speechifying?' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'unusually social minister turning up outside' is the wordplay.
'unusually' is an anagram indicator.
'minister' becomes 'rev' (short for reverend).
'turning up' says the letters should be written backwards.
'outside' is an insertion indicator (some letters go outside others).
'rev' reversed gives 'ver'.
'social' is an anagram of 'ocalis'.
'ocalis' inserted within 'ver' is 'VOCALISER'.

Can you help me to learn more?