Endless spring meadow (3)
I believe the answer is:
lea
'meadow' is the definition.
(I've seen this before)
'endless spring' is the wordplay.
'endless' means to remove the last letter.
'spring' becomes 'leap' (both can mean to jump).
'leap' with its final letter taken away is 'LEA'.
(Other definitions for lea that I've seen before include "'The lowing herd wind slowly o'er the . . .'" , "pastoral setting" , "Land growing grass" , "Tract of pastureland" , "area of grassland" .)