Cat miles away from this plant? (8)
I believe the answer is:
clematis
'this plant?' is the definition.
(type of plant)
'cat miles away' is the wordplay.
'away' is an anagram indicator (letters move away from their original places).
'cat'+'miles'='catmiles'
'catmiles' anagrammed gives 'CLEMATIS'.
'from' is the link.
(Other definitions for clematis that I've seen before include "Ornamental climber" , "Old man's beard" , "it may cover walls" , "Climates (anag)" , "Climbing garden plant" .)