Programme is on a lease — that’s clear (8)
I believe the answer is:
apparent
'clear' is the definition.
(synonyms)
'programme is on a lease' is the wordplay.
'programme' becomes 'app' (type of computer programme).
'is on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'lease' becomes 'rent' (synonyms).
'app'+'a'+'rent'='APPARENT'
'that's' acts as a link.
(Other definitions for apparent that I've seen before include "Seeming real or true" , "Ostensible, seeming" , "Clearly visible" , "Quite obvious and clear" , "Obvious, clearly understood" .)