Feel uneasy about importing a plant (6)
I believe the answer is:
yarrow
'plant' is the definition.
(yarrow is a kind of plant)
'feel uneasy about importing a' is the wordplay.
'feel uneasy' becomes 'worry'.
'about' is a reversal indicator.
'importing' means one lot of letters goes inside another.
'worry' written backwards gives 'yrrow'.
'yrrow' placed around 'a' is 'YARROW'.
(Other definitions for yarrow that I've seen before include "Creeping plant, also called milfoil" , "Wild aromatic plant" , "Strong-scented plant, rhymes with not wide" , "Strong-scented creeping plant, once used in herbal medicine" , "Flowering plant" .)