Fellow joins 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)
'fellow joins the spanish' is the wordplay.
'fellow' becomes 'chap' (both can mean a man).
'joins' is a charade indicator (letters next to each other).
'the spanish' becomes 'el' ('the' in Spanish).
'chap'+'el'='CHAPEL'
(Other definitions for chapel that I've seen before include "Good place" , "Part of church with its own altar" , "union group" , "Place used for Christian worship - smaller than cathedral" , "service" .)