A row involving the Spanish workshop (7)
I believe the answer is:
atelier
'workshop' is the definition.
(thesaurus)
'a row involving the spanish' is the wordplay.
'row' becomes 'tier' (tier is a kind of row**).
'involving' is an insertion indicator.
'the spanish' becomes 'el'.
'tier' enclosing 'el' is 'telier'.
'a'+'telier'='ATELIER'
(Other definitions for atelier that I've seen before include "Designer's workshop" , "Artist's workshop, studio" , "Artist's studio (French)" , "room for artist" , "I relate to workshop used by artist" .)