Strange deed within which I say you see and derive as a conclusion (6)
I believe the answer is:
deduce
'derive as a conclusion' is the definition.
I can't judge whether this definition defines the answer.
'strange deed within which i say you see' is the wordplay.
I cannot really understand how this works, but
'you' could be 'u' (commonly used in online communication) and 'u' is found in the answer.
'see' could be 'c' (the word for the letter, according to Chambers) and 'c' is present in the answer.
an anagram of 'deed' is 'dede' which is within the left over letters.
No letters remain.
This explanation may well be incorrect...
'and' is the link.
Can you help me to learn more?
(Other definitions for deduce that I've seen before include "Figure out as Sherlock did" , "Arrive at reasoned conclusion from facts" , "Reason through logic" , "Reason out (something)" , "Work out" .)