Scorched around a lot when plastered! (7)
I believe the answer is:
smeared
'when plastered' is the definition.
The answer and definition can be both to do with contact as well as being past participle verbs.
Maybe you can see an association between them that I don't see?
'scorched around a lot' is the wordplay.
'scorched' becomes 'seared' ('sear' can be a synonym of 'scorch').
'around' is an insertion indicator.
'a lot' becomes 'm'.
'seared' going around 'm' is 'SMEARED'.
Can you help me to learn more?
(Other definitions for smeared that I've seen before include "Bedaubed" , "Wiped across" , "Daubed" .)