Part of meadow flower, primarily? (4)
I believe the answer is:
leaf
'part' is the definition.
(leaf is a kind of part)
'meadow flower primarily?' is the wordplay.
'meadow' becomes 'lea' (I've seen this before).
'primarily?' suggests taking the first letters (I've seen 'primarily' mean this).
The initial letter of 'flower' is 'f'.
'lea'+'f'='LEAF'
'of' acts as a link.
(Other definitions for leaf that I've seen before include "Tree part - page" , "following 28 [SILVER]" , "Bit of tree, of book" , "Page - part of a plant" , "Hinged or removable table flap" .)