Exercise is able to provide nutrition (5)
I believe the answer is:
pecan
'nutrition' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'exercise is able to' is the wordplay.
'exercise' becomes 'pe' (Physical Education).
'is able to' becomes 'can' (I've seen this before).
'pe'+'can'='PECAN'
'provide' acts as a link.
Can you help me to learn more?
(Other definitions for pecan that I've seen before include "Type of nut" , "Edible nut like a smooth walnut" , "of nuts" , "Species of hickory - edible nut" , "nut-tree" .)