Deceive one so as to assuage sad feelings (7)
I believe the answer is:
console
'assuage sad feelings' is the definition.
'console' can be an answer for 'assuage' (thesaurus). I am not certain of the 'sad feelings' bit.
'deceive one so as' is the wordplay.
I cannot really see how this works, but
'deceive' could be 'con' (I've seen this in another clue) and 'con' is found within the answer.
'one' could be 'sole' (synonyms) and 'sole' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for console that I've seen before include "Cheer in distress" , "Comfort - control panel" , "Calm" , "Give moral or emotional strength to" , "Give comfort to (someone) for a loss" .)