Secreted in chancel even, this ordinal (8)
I believe the answer is:
eleventh
'ordinal' is the definition.
('eleventh' can be similar in meaning to 'ordinal')
'secreted in chancel even this' is the wordplay.
'secreted' says the answer is hidden in the clue.
'ELEVENTH' is hidden in the letters of 'in chancel even this'.
(Other definitions for eleventh that I've seen before include "The hour to be saved at in the nick of time" , "At this hour, it's the last possible moment" , "Ordinal number" , "This hour is the latest possible time for doing something" , "Heel vent (anag)" .)