Frond in meadow flower's opening (4)
I believe the answer is:
leaf
'frond' is the definition.
(I've seen this before)
'meadow flower's opening' is the wordplay.
'meadow' becomes 'lea' (a lea is a grassy area).
'opening' says to take the initial letters.
The initial letter of 'flower' is 'f'.
'lea'+'f'='LEAF'
'in' is the link.
(Other definitions for leaf that I've seen before include "Two pages of a book" , "following 28 [SILVER]" , "Part of tree or book" , "Organ of photosynthesis in plants" , "Single sheet of a book" .)