Militia man and learner consumed sweet (9)
I believe the answer is:
chocolate
'sweet' is the definition.
(thesaurus)
'militia man and learner consumed' is the wordplay.
'militia man' becomes 'choco' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'consumed' becomes 'ate' (to eat is to consume food).
'choco'+'l'+'ate'='CHOCOLATE'
Can you help me to learn more?
(Other definitions for chocolate that I've seen before include "Drink (if hot)" , "Delicious food of roasted ground cacao beans" , "Deep brown colour" , "Addictive substance from beans" , "The tasty substance could be a cool cheat 99)" .)