Drunk riles chap getting round (9)
I believe the answer is:
spherical
'round' is the definition.
('spherical' can be similar in meaning to 'round')
'drunk riles chap getting' is the wordplay.
'drunk' is an anagram indicator.
'getting' says to put letters next to each other.
'riles'+'chap'='rileschap'
'rileschap' is an anagram of 'SPHERICAL'.
(Other definitions for spherical that I've seen before include "Like a ball" , "Rotund" , "As balls" , "Like cannonballs" , "Ball shaped" .)