Regarding province, say nothing to shock (8)
I believe the answer is:
astonish
'shock' is the definition.
(thesaurus)
'regarding province say nothing' is the wordplay.
'regarding' becomes 'asto'.
'province' becomes 'ni' (I've seen this in other clues).
'say nothing' becomes 'sh' (I've seen this in other clues).
'asto'+'ni'+'sh'='ASTONISH'
'to' acts as a link.
(Other definitions for astonish that I've seen before include "Provoke wonder" , "Amaze, astound" , "Greatly impress" , "Shock with surprise" , "Startle" .)