Cleaner line drawn into sand (6)
I believe the answer is:
bleach
'cleaner' is the definition.
(I've seen this before)
'line drawn into sand' is the wordplay.
I cannot quite see how this works, but
'line' could be 'l' (used when specifying particular lines from a poem) and 'l' is located in the answer.
'sand' could be 'beach' (sand can refer to a sandy beach) and 'beach' is located in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bleach that I've seen before include "Purge" , "Chemical whitener" , "Agent that makes things white or colourless" , "Sink and toilet cleaner" , "Remove colour from" .)