Stream Queen single, left second in playlist (4)
I believe the answer is:
rill
'stream' is the definition.
(rill is a kind of stream)
'queen single left second in playlist' is the wordplay.
I cannot really see how this works, but
'queen' could be 'r' (r is abbreviation regina. e.g. in ER ) and 'r' is present in the answer.
'single' could be 'i' (one) and 'i' is located in the answer.
'left' could be 'l' (common abbreviation) and 'l' is found within the answer.
A single letter 'l' remains which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rill that I've seen before include "Burn" , "Brooklet" , "Flowing water" , "Small brook" , "Little stream" .)