Economies turned round firm producing fine plaster (6)
I believe the answer is:
stucco
'fine plaster' is the definition.
(I've seen this in another clue)
'economies turned round firm' is the wordplay.
'economies' becomes 'cuts' (I can't justify this - if you can you should believe this answer much more).
'turned round' is a reversal indicator.
'firm' becomes 'co' (a firm is a company).
'cuts' back-to-front is 'stuc'.
'stuc'+'co'='STUCCO'
'producing' is the link.
Can you help me to learn more?
(Other definitions for stucco that I've seen before include "Fine plaster for decoration" , "Outside coat" , "Mouldable wall plaster" , "material for covering wall" , "Plaster for decorative work" .)