Involved in forming a new dateline (8)
I believe the answer is:
entailed
'involved in' is the definition.
'entailed' can be an answer for 'involved' (I've seen this in another clue). I am not sure about the 'in' bit.
'a new dateline' is the wordplay.
'a new' indicates an anagram.
'dateline' is an anagram of 'ENTAILED'.
'forming' is the link.
Can you help me to learn more?
(Other definitions for entailed that I've seen before include "Dateline? (anag)" , "settled on designated heirs" , "Needed" , "This property can't be sold" , "It's involved" .)