Some colonel visited the King? (5)
I believe the answer is:
elvis
'king?' is the definition.
(I have seen 'The King' mean 'elvis' so perhaps 'king' could also mean 'elvis')
'some colonel visited the' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'ELVIS' can be found hidden inside 'colonel visited the'.
(Other definitions for elvis that I've seen before include "Much-impersonated singer, d. 1977" , "Deceased king of rock 'n' roll" , "Lives for rock'n'roll king" , "Jailhouse Rock star" , "Mister Presley for one" .)