Is youngster able to eat here? (7)
I believe the answer is:
canteen
'eat here?' is the definition.
(place for eating)
'is youngster able' is the wordplay.
I cannot really see how this works, but
'youngster' could be 'teen' (I've seen this before) and 'teen' is present in the answer.
'able' could be 'can' and 'can' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'to' is the link.
(Other definitions for canteen that I've seen before include "Drinks flask" , "Refectory" , "Water or cutlery container" , "Employees' restaurant" , "Staff eating area" .)