Plan church sculpture? (5)
I believe the answer is:
chart
'plan' is the definition.
(chart can mean a plan or diagram)
'church sculpture?' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'sculpture?' becomes 'art' (sculpture is a kind of art).
'ch'+'art'='CHART'
(Other definitions for chart that I've seen before include "Visual display of information" , "Navigational map" , "Plan" , "Map to assist navigation by sea" , "series of plots?" .)