Tiny resilient creature is slow sort, they say (10)
I believe the answer is:
tardigrade
'tiny resilient creature' is the definition.
'tardigrade' can be an answer for 'creature' (tardigrade is a kind of animal). I am unsure of the 'tiny resilient' bit.
'slow sort they say' is the wordplay.
I cannot quite understand how this works, but
'sort' could be 'grade' (grading is a kind of sorting) and 'grade' is located in the answer.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Another definition for tardigrade that I've seen is " See water bear".)