River split after type of junction (5)
I believe the answer is:
trent
'river' is the definition.
(River Trent)
'split after type of junction' is the wordplay.
I cannot quite see how this works, but
'split' could be 'rent' (past tense of 'rend' meaning to split) and 'rent' is found within the answer.
'junction' could be 't' and 't' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for trent that I've seen before include "running water" , "River through Newark" , "Eng. river; Council of -" , "Little Nell family; Eng. river" , "River flowing through Nottingham" .)