Prepared the toast, say, to have in bed (8)
I believe the answer is:
buttered
'bed' is the definition.
The definition and answer can be both to do with contact as well as being past participle verbs.
Perhaps you can see a link between them that I can't see?
'prepared the toast say to have' is the wordplay.
'prepared the toast' becomes 'butte' (I can't justify this - if you can you should give a lot more credence to this answer).
'say' indicates a 'sounds like' (homophone) clue.
'to have' becomes 'read' (reading is a kind of having).
'read' sounds like 'red'.
'butte'+'red'='BUTTERED'
'in' acts as a link.
Can you help me to learn more?
(Another definition for buttered that I've seen is " Covered with dairy spread".)