Worshipful words at wedding: our last, regrettably (10)
I believe the answer is:
idolatrous
'worshipful' is the definition.
(thesaurus)
'words at wedding our last regrettably' is the wordplay.
'words at wedding' becomes 'i do' (wedding vows).
'regrettably' indicates anagramming the letters.
'our'+'last'='ourlast'
'ourlast' with letters rearranged gives 'latrous'.
'ido'+'latrous'='IDOLATROUS'
(Other definitions for idolatrous that I've seen before include "Worshipping inappropriately" , "Worshipping images" , "Inappropriately worshipful" , "worshipping wrongly" , "devoted to figures" .)