Soggy pitch with damage on top (6)
I believe the answer is:
marshy
'soggy' is the definition.
(I've seen this before)
'pitch with damage on top' is the wordplay.
'pitch with' becomes 'shy' (I've seen this before. I am not sure about the 'with' bit.**).
'damage' becomes 'mar' (marring is a kind of damaging).
'on top' is a charade indicator (letters next to each other) (down clues only).
'shy' put after 'mar' is 'MARSHY'.
(Other definitions for marshy that I've seen before include "Waterlogged ground" , "Damp and low-lying" , "(Of soil) soft and wet" , "Boggy, swampy" , "(Of ground) wet" .)