Record contagion restricting people's fun (13)
I believe the answer is:
entertainment
'fun' is the definition.
(I've seen this before)
'record contagion restricting people's' is the wordplay.
'record' becomes 'enter' (synonyms).
'contagion' becomes 'taint' (something contaminated or tainted).
'restricting' means one lot of letters goes inside another.
'people' becomes 'men' (men are people).
'taint' enclosing 'men' is 'tainment'.
'enter'+'tainment'='ENTERTAINMENT'
(Other definitions for entertainment that I've seen before include "Pleasure-giving" , "fun" , "Provision of hospitality" , "sport" , "Recreation activity" .)