Comic character who lacked a head for speaking (2,4)
I believe the answer is:
mr bean
'comic character' is the definition.
(character played by Rowan Atkinson)
'lacked a head for speaking' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'who' acts as a link.
(Other definitions for mr bean that I've seen before include "Inept Rowan Atkinson character" , "TV comedy show" , "TV series about buffoon" .)