This did seem, perhaps, a bad thing to do (7)
I believe the answer is:
misdeed
'do' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'this did seem perhaps a bad thing' is the wordplay.
'did seem' can be anagrammed to 'MISDEED'.
But, I'm unsure how this is indicated.
'to' is the link.
Can you help me to learn more?
(Other definitions for misdeed that I've seen before include "Wicked/illegal act" , "Improper act" , "Wicked or illegal act" , "crime" , "Improper, wicked or immoral behaviour" .)