Eases off as they lift up part of headset, abashedly (6)
I believe the answer is:
abates
'eases off' is the definition.
(I've seen this in another clue)
'up part of headset abashedly' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'part of' indicates the answer is hidden within the clue.
'setaba' can be found hidden inside 'headset abashedly'.
'setaba' reversed gives 'ABATES'.
'as they lift' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for abates that I've seen before include "Goes down like storm" , "Slacks off" , "'Lets up, dies away (6)'" , "Becomes less intense" , "Makes less intense" .)