Yes, acts in variety will produce great delight (7)
I believe the answer is:
ecstasy
'great delight' is the definition.
(I've seen this before)
'yes acts in variety' is the wordplay.
'in variety' indicates an anagram (I've seen this in other clues).
'yes'+'acts'='yesacts'
'yesacts' is an anagram of 'ECSTASY'.
'will produce' acts as a link.
(Other definitions for ecstasy that I've seen before include "Feeling of great rapture" , "Feeling of intense delight, or stimulant drug" , "Extreme happiness" , "Feeling of immense rapture" , "Overwhelming joy" .)