Likelihood of six having talent? (9)
I believe the answer is:
viability
'likelihood' is the definition.
(viability can mean likelihood of success)
'six having talent?' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'having' means one lot of letters go next to another.
'talent?' becomes 'ability' (talent is a kind of ability).
'vi'+'ability'='VIABILITY'
'of' is the link.
(Other definitions for viability that I've seen before include "Aptitude for living" , "likelihood of success" .)