Turtle is ground with pepper. (8)
The definition is turtle. The wordplay is P for pepper (some pepper shakers have a P on them) inside TERRAIN or ground.
Reason/how I came to this
There is a breed of turtle that is a spotted turtle - something that is spotted is sometimes referred to as peppered
Taking "ground" as an anagram indicator and "turtle is" as the 8 letters to be rearranged gives SLUTTIER, but I don't see how this is defined by "with pepper". If it the definition part was "with more pepper" = "spicier" = "sexier", that might work.
Could this be
I did this
and "trouper" has become something that I've distinguished as a word by reading across the lines