Eat selectively from both sides of display cabinet (4)
I believe the answer is:
diet
'cabinet' is the definition.
(thesaurus)
'eat selectively from both sides of display' is the wordplay.
'eat selectively' becomes 'di' (I can't justify this - if you can you should give a lot more credence to this answer).
'from' says to put letters next to each other.
'both sides of' says to hollow out the word (remove centre letters) (only the letters on the sides remain).
'display' becomes 'eclat' (I've seen this before).
'eclat' with its centre taken out is 'et'.
'di'+'et'='DIET'
Can you help me to learn more?
(Other definitions for diet that I've seen before include "Legislative assembly in some countries" , "Part of regime" , "International conference" , "Restricted cheer" , "Health food - Council" .)