Are about to perform worship (5)
I believe the answer is:
adore
'worship' is the definition.
(thesaurus)
'are about to perform' is the wordplay.
'about' is an insertion indicator.
'to perform' becomes 'do' ('do' can be a synonym of 'perform').
'are' enclosing 'do' is 'ADORE'.
(Other definitions for adore that I've seen before include "Love (someone) deeply" , "Treasure" , "Respect deeply" , "Cherish" , "Very much like" .)