Aggressiveness greeting bishops at one’s Mass (7)

I believe the answer is:

yobbism

'aggressiveness' is the definition.

'greeting bishops at one's mass' is the wordplay.
'greeting' becomes 'yo'.
'bishops' becomes 'bb' (I've seen this in other clues).
'at' is a charade indicator (letters next to each other).
'one's' becomes 'is' (Roman numeral).
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'yo'+'bb'+'is'+'m'='YOBBISM'

I've seen this clue in The Times.

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