Dietary supplement from which a queen benefits? (5,5)
I believe the answer is:
royal jelly
'dietary supplement' is the definition.
(substance secreted by bees)
'a queen benefits?' is the wordplay.
'a queen' becomes 'royal' (I've seen this before).
'benefits?' becomes 'jelly' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'royal'+'jelly'='ROYAL JELLY'
'from which' acts as a link.
Can you help me to learn more?
(Other definitions for royal jelly that I've seen before include "Special food made by workers" , "Workers produce it" , "Food for queen and larvae" , "Bees secretion" , "Honey bee secretion" .)