Charlie boy getting dressed (4)
I believe the answer is:
clad
'dressed' is the definition.
(to be clad in something is to be dressed in it)
'charlie boy getting' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet: alpha, bravo, charlie etc.).
'boy' becomes 'lad' (informal term for boy).
'getting' means one lot of letters go next to another.
'c'+'lad'='CLAD'
(Other definitions for clad that I've seen before include "Invested" , "Clothed, covered" , "Dressed" , "Decked" , "Provided with covering" .)