10 across
Student
tucked
into
square
meal
(5)
Student tucked into square meal (5)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition is meal, since ground grain fits that sense of the word. You've got L (learner, your student) tucked inside FOUR (a square number), giving you F-L-OUR.