Candid presenter welcomes vacuous nuisance (6)
I believe the answer is:
honest
'candid' is the definition.
(I've seen this before)
'presenter welcomes vacuous nuisance' is the wordplay.
'presenter' becomes 'host' (as in the host of a TV show).
'welcomes' is an insertion indicator (in sense of 'invites in').
'vacuous' suggests removing the centre.
'nuisance' with its centre taken out is 'ne'.
'host' placed around 'ne' is 'HONEST'.
(Other definitions for honest that I've seen before include "See 1" , "Honourable, true" , "Genuine - I promise you!" , "Honourable, sincere" , "Truthful in manner" .)