Feathery seeds, primarily tiny, scattered in the Wolds (11)
I believe the answer is:
thistledown
'feathery seeds' is the definition.
(I've seen this before)
'primarily tiny scattered in the wolds' is the wordplay.
'primarily' indicates taking the first letters.
'scattered' indicates anagramming the letters.
The first letter of 'tiny' is 't'.
'in'+'the'+'wolds'='inthewolds'
'inthewolds' anagrammed gives 'histledown'.
't'+'histledown'='THISTLEDOWN'
(Other definitions for thistledown that I've seen before include "Light fluffy seeds" , "Light fluff of some seeds" , "Airborne seeds" , "Wind-blown seeds and fluff" , "parachutes" .)