A stupid price for sketch (9)
I believe the answer is:
adumbrate
'sketch' is the definition.
(synonyms)
'a stupid price' is the wordplay.
'stupid' becomes 'dumb' (similar in meaning).
'price' becomes 'rate' (I've seen this before).
'a'+'dumb'+'rate'='ADUMBRATE'
'for' acts as a link.
(Other definitions for adumbrate that I've seen before include "sketch" , "Foreshadow with a drumbeat" , "Obscure" , "Faintly indicate" , "Indicate or describe in a general way" .)