Mould society with lifestyle restraining power (9)
I believe the answer is:
sculpture
'mould' is the definition.
(sculpturing is a kind of moulding)
'society with lifestyle restraining power' is the wordplay.
'society' becomes 's' (common abbreviation in names of organisations).
'with' says to put letters next to each other.
'lifestyle' becomes 'culture'.
'restraining' means one lot of letters goes inside another.
'power' becomes 'p'.
'culture' going around 'p' is 'culpture'.
's'+'culpture'='SCULPTURE'
(Other definitions for sculpture that I've seen before include "Artwork produced by carving, moulding etc" , "3-D art form" , "Plastic art" , "artistic work" , "Art in three dimensions" .)