Middle of emmental portion served up to catch vermin? (6)
I believe the answer is:
entrap
'catch vermin?' is the definition.
'entrap' can be an answer for 'catch' (entrapping is a kind of catching). I'm not sure about the 'vermin?' bit.
'middle of emmental portion served up' is the wordplay.
'middle of' says to take the centre.
'portion' becomes 'part' ('part' can be a synonym of 'portion'**).
'served up' shows that the letters should be reversed in order.
The middle letters of 'emmental' are 'en'.
'part' back-to-front is 'trap'.
'en'+'trap'='ENTRAP'
'to' is the link.
Can you help me to learn more?
(Other definitions for entrap that I've seen before include "net" , "Catch like parent" , "Catch in a snare" , "Catch - frame" , "Lure into danger" .)