Stuck in weed, dog lost the ball (6)
I believe the answer is:
wedged
'stuck' is the definition.
(I've seen this before)
'in weed dog lost the ball' is the wordplay.
'in' is an insertion indicator.
'lost' is a deletion indicator.
'the ball' becomes 'o'.
'dog' with 'o' removed is 'dg'.
'weed' placed around 'dg' is 'WEDGED'.
(Other definitions for wedged that I've seen before include "Stuffed in between other things" , "Jammed in between other things" , "Packed tightly between other things" , "Stuck" , "Packed, squeezed in" .)