Signal to stir Reverend East, unwell before start of Eucharist (8)
I believe the answer is:
reveille
'signal' is the definition.
(reveille is a kind of signal)
'reverend east unwell before start of eucharist' is the wordplay.
'reverend' becomes 'rev'.
'east' becomes 'e' (abbreviation).
'unwell' becomes 'ill' (similar in meaning).
'before' says to put letters next to each other.
'start of' says to take the initial letters.
The initial letter of 'eucharist' is 'e'.
'rev'+'e'+'ill'+'e'='REVEILLE'
'to stir' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for reveille that I've seen before include "Summons to get up" , "Rousing bugle-call" , "Soldiers' wake-up call" , "Morning call" , "Signal to awaken soldiers at daybreak" .)