TV presenter to make secure (6)
I believe the answer is:
anchor
This clue is a double definition.
'tv presenter' is the first definition.
(I've seen this before)
'make secure' is the second definition.
(thesaurus)
'to' is the link.
(Other definitions for anchor that I've seen before include "One holding firmly in place" , "Last runner in relay race team" , "Member of relay team" , "It may be used to secure" , "Make fast" .)