Tea party's beginning next to the Spanish place of worship (6)
I believe the answer is:
chapel
'place of worship' is the definition.
(chapel is a kind of place of worship)
'tea party's beginning next to the spanish' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'beginning' indicates taking the first letters.
'next to' says to put letters next to each other.
'the spanish' becomes 'el' ('the' in Spanish).
The initial letter of 'partys' is 'p'.
'cha'+'p'+'el'='CHAPEL'
(Other definitions for chapel that I've seen before include "house of prayer" , "Part of church with its own altar" , "Perhaps part of cathedral" , "Part of a large church" , "service" .)