Relief especially seen during ceremony (7)
I believe the answer is:
respite
'relief' is the definition.
(synonyms)
'especially seen during ceremony' is the wordplay.
'especially' becomes 'esp' (common abbreviation).
'seen during' indicates putting letters inside.
'ceremony' becomes 'rite' (rite is a kind of ceremony).
'esp' inserted within 'rite' is 'RESPITE'.
(Other definitions for respite that I've seen before include "Breathing space" , "Period of relief (from unpleasant thing)" , "interruption" , "Pause from exertion, etc" , "See trip (anag.)" .)