Good book needs no introduction after journalist described it as digestible (6)
I believe the answer is:
edible
'digestible' is the definition.
(associated in meaning)
'good book needs no introduction after journalist' is the wordplay.
'good book' becomes 'bible' (synonyms).
'needs no introduction' means to remove the first letter.
'after' says to put letters next to each other.
'journalist' becomes 'ed' (short for editor).
'bible' with its initial letter removed is 'ible'.
'ible' after 'ed' is 'EDIBLE'.
'described it as' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for edible that I've seen before include "description of fare" , "can be taken in" , "Suitable for use as food" , "One's fare should be" , "Palatable" .)