Activity disturbing men at internet? (13)
I believe the answer is:
entertainment
'activity' is the definition.
(entertainment is a kind of activity)
'disturbing men at internet?' is the wordplay.
'disturbing' indicates an anagram (I've seen this in other clues).
'men'+'at'+'internet'='menatinternet'
'menatinternet' with letters rearranged gives 'ENTERTAINMENT'.
(Other definitions for entertainment that I've seen before include "Recreation activity" , "fun" , "Diverting activity" , "show business" , "Amusement; hospitality" .)