Possible troll with loudspeaker (7)
I believe the answer is:
tweeter
'loudspeaker' is the definition.
(I've seen this before)
'possible troll with' is the wordplay.
I cannot quite understand how this works, but
'with' could be 'w' (abbreviation) and 'w' is found within the answer.
The remaining letters 'teeter' is a valid word 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 tweeter that I've seen before include "One relaying notes" , "piece of hi-fi" , "little Speaker" , "High-frequency loudspeaker - small bird?" , "highly effective in reproducing sound" .)