Studio that is later converted (7)
I believe the answer is:
atelier
'studio' is the definition.
(atelier is a kind of studio)
'that is later converted' is the wordplay.
I cannot quite understand how this works, but
'that is' could be 'ie' (abbreviation for id est, 'that is' in Latin) and 'ie' is found in the answer.
an anagram of 'later' is 'atelr' which is within the left over letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for atelier that I've seen before include "room for artist" , "Artist's workshop, studio" , "Artist's workroom" , "Tie earl up in the artist's place" , "Designer's workshop" .)