Pleasure explosive to me and Jenny (9)
I believe the answer is:
enjoyment
'pleasure' is the definition.
(I know that enjoyment is a type of pleasure)
'explosive to me and jenny' is the wordplay.
'explosive' indicates anagramming the letters.
'and' means one lot of letters go next to another.
'to'+'me'='tome'
'tome' put after 'jenny' is 'jennytome'.
'jennytome' with letters rearranged gives 'ENJOYMENT'.
(Other definitions for enjoyment that I've seen before include "Happiness" , "The pleasure felt when having a good time" , "Gusto" , "Taking pleasure in something" , "Delight" .)