Half-cut sermoniser tipped over the frankincense (5)
I believe the answer is:
resin
'the frankincense' is the definition.
(thesaurus)
'half-cut sermoniser tipped' is the wordplay.
'half cut' means to take half the letters.
'tipped' says the letters should be written backwards.
'sermoniser' with half the letters taken is 'niser'.
'niser' backwards is 'RESIN'.
'over' acts as a link.
(Other definitions for resin that I've seen before include "It exudes from pines" , "Sap product" , "Sticky stuff as from pine tree" , "Myrrh, for instance" , "Sticky exudation from trees" .)