Frame given position in bottom of the box (8)
I believe the answer is:
espalier
'frame' is the definition.
(espalier is a kind of frame)
'position in bottom of the box' is the wordplay.
'position' becomes 'lie' (lie can mean to place or position).
'in' is an insertion indicator.
'bottom of' suggests the final letters.
'box' becomes 'spar' (spar can mean to box).
The last letter of 'the' is 'e'.
'e'+'spar'='espar'
'lie' put inside 'espar' is 'ESPALIER'.
'given' acts as a link.
(Other definitions for espalier that I've seen before include "Fruit tree trained to grow against a wall" , "Trained fruit-tree" , "Lattice for growing plants" , "train a plant" , "flattened tree" .)