Delivery of blade and nastily snide son lead to immoral actions (10)
I believe the answer is:
sordidness
'delivery of blade' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'nastily snide son lead to immoral actions' is the wordplay.
'nastily' indicates anagramming the letters.
'lead' indicates taking the first letters.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'immoral actions' becomes 'sord' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'son' is 's'.
'snide' anagrammed gives 'idnes'.
'idnes'+'s'='idness'
'idness' put after 'sord' is 'SORDIDNESS'.
'and' acts as a link.
Can you help me to learn more?