Satisfaction guaranteed after request (8)
I believe the answer is:
pleasure
'satisfaction' is the definition.
(I know that satisfaction can be written as pleasure)
'guaranteed after request' is the wordplay.
'guaranteed' becomes 'sure' (I've seen this in another clue).
'after' means one lot of letters go next to another.
'request' becomes 'plea' (plea is a kind of request).
'sure' put after 'plea' is 'PLEASURE'.
(Other definitions for pleasure that I've seen before include "entertainment" , "Happy satisfaction" , "A repulse (anag.)" , "A desirable emotion" , "contentment" .)