Spring meadow with the first sign of poppies (4)
I believe the answer is:
leap
'spring' is the definition.
(both can mean to jump)
'meadow with the first sign of poppies' is the wordplay.
'meadow' becomes 'lea' (a lea is a grassy area).
'with' says to put letters next to each other.
'the first sign of' suggests taking the first letters.
The initial letter of 'poppies' is 'p'.
'lea'+'p'='LEAP'
(Other definitions for leap that I've seen before include "Abrupt change; spring" , "Sort of year" , "vault" , "Jump, spring" , "Jump suddenly" .)