Charlie’s excitedly welcoming Penny round (9)
I believe the answer is:
spherical
'round' is the definition.
(similar in meaning)
'charlie's excitedly welcoming penny' is the wordplay.
'excitedly' indicates anagramming the letters (letters excited or stimulated into a new form).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'penny' becomes 'p' (short for pence).
'charlies' with letters rearranged gives 'sherical'.
'sherical' going around 'p' is 'SPHERICAL'.
(Other definitions for spherical that I've seen before include "Like a ball" , "Ball-shaped" , "Completely round" , "Rotund" , "Ball shaped" .)