Impeded by the deer - wild deer (8)
I believe the answer is:
hindered
'impeded' is the definition.
('hinder' can be a synonym of 'impede')
'by the deer wild deer' is the wordplay.
'by' says to put letters next to each other.
'the deer' becomes 'hind' (hind is a kind of deer**).
'wild' indicates anagramming the letters.
'deer' anagrammed gives 'ered'.
'hind' put next to 'ered' is 'HINDERED'.
(Other definitions for hindered that I've seen before include "Hampered, obstructed" , "Impeded" , "Kept back, hampered" , "Obstructed - delayed" , "Obstructed and got in the way" .)