Compared to young Kenneth inside, awfully idle (7)
I believe the answer is:
likened
'compared' is the definition.
('liken' can be a synonym of 'compare')
'young kenneth inside awfully idle' is the wordplay.
'young kenneth' becomes 'ken' (I've seen this in other clues. I am not sure about the 'young' bit.).
'inside' is an insertion indicator.
'awfully' indicates anagramming the letters.
'idle' anagrammed gives 'lied'.
'ken' inserted within 'lied' is 'LIKENED'.
'to' is the link.
Can you help me to learn more?
(Other definitions for likened that I've seen before include "Resembled" , "Equated" , "Pointed out resemblance or compared" .)