Church ceremony, baptism, requires two days for tourist on vacation (7)
I believe the answer is:
wedding
'church ceremony baptism' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'two days for tourist on vacation' is the wordplay.
'two days' can mean two substitutions for 'day'.
'day' becomes 'wed'.
'day' becomes 'd'.
'for' says to put letters next to each other.
'tourist on vacation' becomes 'ing' (I can't explain this - if you can you should give a lot more credence to this answer).
'wed'+'d'+'ing'='WEDDING'
'requires' acts as a link.
Can you help me to learn more?
(Other definitions for wedding that I've seen before include "Marriage ceremony" , "Nuptial ceremony" , "Audience for the 13 14" , "following 28 [SILVER]" , "Nuptials" .)