Medium art is better left to the wind (7)
I believe the answer is:
mistral
'the wind' is the definition.
(mistral is a kind of wind)
'medium art is better left' is the wordplay.
'medium' becomes 'm' (as in UK clothing sizes).
'better' indicates an anagram (with an improved letter-order).
'left' becomes 'l' (common abbreviation).
'art'+'is'='artis'
'artis' anagrammed gives 'istra'.
'm'+'istra'+'l'='MISTRAL'
'to' is the link.
(Other definitions for mistral that I've seen before include "Cold dry wind in southern France" , "Violent northeast wind of southern France" , "French wind" , "Famous wind in the Rhone Valley blowing towards the Med" , "Strong cold dry wind" .)