Ceremony is just caught (4)
I believe the answer is:
rite
'ceremony' is the definition.
(rite is a kind of ceremony)
'just caught' is the wordplay.
'just' becomes 'right' ('right' can be similar in meaning to 'just').
'caught' indicates a 'sounds like' (homophone) clue (to catch something can mean to hear it).
'right' is a homophone of 'RITE'.
'is' is the link.
(Other definitions for rite that I've seen before include "Formal procedure" , "Ceremony - ritual" , "Solemn ceremony" , "Ceremonial act" , "(Words used in) ceremonial" .)