Immediately used odd sculpture (6)
I believe the answer is:
statue
'sculpture' is the definition.
(statue is a kind of sculpture)
'immediately used odd' is the wordplay.
'immediately' becomes 'stat' (stat can informally mean at once).
'odd' indicates alternate letters.
The alternate letters of 'used' are 'ue'.
'stat'+'ue'='STATUE'
(Other definitions for statue that I've seen before include "Artistic work" , "Carved or cast figure" , "A carved image or effigy" , "Sculpture representing a human or animal" , "Still work" .)