Pitch princess and incline to be slow-walking (10)
I believe the answer is:
tardigrade
'be slow-walking' is the definition.
I can't tell whether this defines the answer.
'pitch princess and incline' is the wordplay.
I cannot really understand how this works, but
'pitch' could be 'tar' (synonyms) and 'tar' is located in the answer.
'princess' could be 'di' (Princess Diana) and 'di' is found within the answer.
'incline' could be 'grade' (I've seen this in another clue) and 'grade' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Another definition for tardigrade that I've seen is " See water bear".)