The clot is prepared to admit one to do some canvassing (7)
I believe the answer is:
solicit
'to do some canvassing' is the definition.
I can't tell whether this definition defines the answer.
'the clot is prepared to admit one' is the wordplay.
'prepared' indicates an anagram.
'to admit' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'clot'+'is'='clotis'
'clotis' is an anagram of 'solict'.
'solict' enclosing 'i' is 'SOLICIT'.
Can you help me to learn more?
(Other definitions for solicit that I've seen before include "Drum up business" , "Ask (someone) for something" , "Request, induce" , "Beg or court" , "Petition - importune" .)