Split up sheep from one field, losing 50 (8)
I believe the answer is:
ramified
'split up' is the definition.
'ramified' can be an answer for 'split' (thesaurus). I am not sure about the 'up' bit.
'sheep from one field losing 50' is the wordplay.
'sheep from one' becomes 'rami' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'losing' suggests deleting specific letters.
'50' becomes 'l' (Roman numeral).
'field' with 'l' removed is 'fied'.
'rami'+'fied'='RAMIFIED'
Can you help me to learn more?
(Another definition for ramified that I've seen is " Branched".)