Exclude old Henman making comeback (4)
I believe the answer is:
omit
'exclude' is the definition.
(I know that exclude can be written as omit)
'old henman making comeback' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'henman' becomes 'tim' (Tim Henman).
'making comeback' says the letters should be written backwards.
'tim' backwards is 'mit'.
'o'+'mit'='OMIT'
(Other definitions for omit that I've seen before include "Leave out or overlook" , "Miss out" , "Exclude; veto" , "by-pass" , "Fail (to do something)" .)