Program and webpage contain nothing relevant (8)
I believe the answer is:
apposite
'relevant' is the definition.
(apposite can mean relevant or appropriate)
'program and webpage contain nothing' is the wordplay.
'program' becomes 'app' (type of computer program).
'and' is a charade indicator (letters next to each other).
'webpage' becomes 'site' (website).
'contain' means one lot of letters goes inside another.
'nothing' becomes 'O' (looks like zero - 0).
'app'+'site'='appsite'
'appsite' going around 'o' is 'APPOSITE'.
(Other definitions for apposite that I've seen before include "Of a remark, suitable for the occasion" , "Befitting" , "Suited for the purpose" , "Appropriate, pertinent" , "Pertinent, well-chosen" .)