Legendary one saved squirrels (7)
I believe the answer is:
storied
'legendary' is the definition.
(I've seen this in another clue)
'one saved squirrels' is the wordplay.
I cannot really see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'saved' could be 'stored' (I've seen this in another clue) and 'stored' is found in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for storied that I've seen is " Fabled".)