Nut to leave boy sated, we hear? (7)
I believe the answer is:
filbert
'nut' is the definition.
(filbert is a kind of nut)
'leave boy sated we hear?' is the wordplay.
I cannot really see how this works, but
'boy' could be 'bert' and 'bert' is found within the answer.
The remaining letters 'fil' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for filbert that I've seen before include "Type of hazelnut" , "Hazel nut" , "Nut -- left rib (anag)" .)