Cook can see nuts provide nourishment (10)
I believe the answer is:
sustenance
'nourishment' is the definition.
(I know that nourishment can be written as sustenance)
'cook can see nuts' is the wordplay.
'cook' is an anagram indicator.
'can'+'see'+'nuts'='canseenuts'
'canseenuts' with letters rearranged gives 'SUSTENANCE'.
'provide' is the link.
(Other definitions for sustenance that I've seen before include "cooking provides this?" , "Nutriment" , "Food and drink" , "Nourishment" .)