Typically affectionate letter from Hugh (3)
I believe the answer is:
hug
'hugh' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I can't see?
'typically affectionate letter' is the wordplay.
'typically affectionate' becomes 'hu' (I am not sure about this - if you are sure you should believe this answer much more).
'letter' becomes 'g'.
'hu'+'g'='HUG'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for hug that I've seen before include "Embrace closely" , "Cuddle" , "Bear-like embrace?" , "Tightly embrace" , "Tight embrace" .)