Hundreds of drops of water will seep away (5)
I believe the answer is:
drain
'seep away' is the definition.
'drain' can be an answer for 'seep' (thesaurus). I am unsure of the 'away' bit.
'hundreds of drops of water' is the wordplay.
I cannot really understand how this works, but
'hundreds' could be 'd' (I've seen this in other clues) and 'd' is present in the answer.
'drops' could be 'rain' (drops of water) and 'rain' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'will' acts as a link.
Can you help me to learn more?
(Other definitions for drain that I've seen before include "To empty (of fluid)" , "Waste channel/pipe" , "Draw off U sewer" , "Wasted down here" , "Nadir (anag.)" .)