Missionary has upset more than half the characters in Salisbury (5)

I believe the answer is:

silas

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'missionary' is the definition.
(early Christian missionary)

'upset more than half the characters in salisbury' is the wordplay.
'SILAS' is hidden backwards in amongst the letters.
But, I am not sure how this is indicated.

'has' is the link.

Can you help me to learn more?

(Other definitions for silas that I've seen before include "Leader of the Jerusalem Church in Acts and Paul's companion" , "Armies snarl (anag), novel by 14 21" , "Forename of miser" , "-- Marner (George Eliot novel)" , "George Eliot's Marner" .)

I've seen this clue in The Telegraph.

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