Damage pitch with mud and water (6)
I believe the answer is:
marshy
'mud and water' is the definition.
I can't judge whether this defines the answer.
'damage pitch' is the wordplay.
'damage' becomes 'mar' (to mar is to spoil or damage).
'pitch' becomes 'shy' (I've seen this before).
'mar'+'shy'='MARSHY'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for marshy that I've seen before include "Bog-like" , "Not solidly grounded" , "Like swamps" , "(Of ground) wet" , "Boggy; waterlogged" .)