Nominal time in strange ritual (7)
I believe the answer is:
titular
'nominal' is the definition.
('titular' can be a synonym of 'nominal')
'time in strange ritual' is the wordplay.
'time' becomes 't'.
'in' is an insertion indicator.
'strange' indicates an anagram.
'ritual' anagrammed gives 'tiular'.
't' going within 'tiular' is 'TITULAR'.
(Other definitions for titular that I've seen before include "Relating to title" , "So called" , "as figureheads" , "Honorary" , "See" .)