Vague implication reportedly losing force (10)
I believe the answer is:
diminuendo
'losing force' is the definition.
(I've seen this before)
'vague implication reportedly' is the wordplay.
I cannot really understand how this works, but
'vague' could be 'dim' (I've seen this before) and 'dim' is found within the answer.
'reportedly' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for diminuendo that I've seen before include "Getting quieter" , "Making less sound" , "becoming quieter" , "Letting sound fade away" , "losing force" .)