Expanding breadbasket featured in core season range (6-3,6)
I believe the answer is:
middle-age spread
'expanding breadbasket' is the definition.
'middle-age spread' can be an answer for 'breadbasket' (both can informally mean the stomach). I'm not certain of the 'expanding' bit.
'core season range' is the wordplay.
'core' becomes 'middle' (I've seen this in another clue).
'season' becomes 'age' (season can mean a period or age).
'range' becomes 'spread' (I can't explain this - if you can you should believe this answer much more).
'middle'+'age'+'spread'='MIDDLE-AGE SPREAD'
'featured in' is the link.
Can you help me to learn more?
(Other definitions for middle-age spread that I've seen before include "Weight problem for those growing older" , "Pot" , "Weight gain in later life" .)