Unimpeded as I must move plant (7)
I believe the answer is:
freesia
'plant' is the definition.
The answer is an example.
'unimpeded as i must move' is the wordplay.
'unimpeded' becomes 'free' (synonyms).
'must move' indicates an anagram.
'as'+'i'='asi'
'asi' anagrammed gives 'sia'.
'free'+'sia'='FREESIA'
(Other definitions for freesia that I've seen before include "Fragrant-flowered plant; faeries (anag.)" , "See fair for fragrant flowers" , "Scented plant from South Africa" , "Fragrant flower (sounds rather cold?)" , "bloomer" .)