Round chapel Sir dashed (9)
I believe the answer is:
spherical
'round' is the definition.
(similar in meaning)
'chapel sir dashed' is the wordplay.
'dashed' indicates anagramming the letters.
'chapel'+'sir'='chapelsir'
'chapelsir' with letters rearranged gives 'SPHERICAL'.
(Other definitions for spherical that I've seen before include "Globe-shaped" , "Like cannonballs" , "Ball shaped" , "Ball-shaped" , "Rotund" .)