Noah's son is no great actor (3)
I believe the answer is:
ham
This could be a double definition.
'noah's son' is the first definition.
(I've seen this in another clue)
'no great actor' is the second definition.
'ham' can be an answer for 'actor' (ham actor is a kind of actor). I am not certain of the 'no great' bit.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for ham that I've seen before include "one rescued from flood" , "Meat for excessive actor" , "Smoked pig-meat" , "Pork leg" , "An actor who overdoes it in meaty way" .)