Fed sons stew (4)
I believe the answer is:
mess
'stew' is the definition.
(I've seen this before)
'fed sons' is the wordplay.
'fed' becomes 'me' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sons' becomes 'ss' (s is abbreviation for son).
'me'+'ss'='MESS'
Can you help me to learn more?
(Other definitions for mess that I've seen before include "Where officers eat" , "dog's dinner" , "Where soldiers may eat" , "Service dining-area" , "Disarray" .)