Almost never coming back unruffled (4)
I believe the answer is:
even
'unruffled' is the definition.
(I've seen this in another clue)
'almost never coming back' is the wordplay.
'almost' means to remove the last letter (almost the whole word is kept).
'coming back' is a reversal indicator.
'never' with its last letter taken off is 'neve'.
'neve' in reverse letter order is 'EVEN'.
(Other definitions for even that I've seen before include "Equally balanced; level" , "All square" , "Peaceful" , "50-50" , "time when sun goes down for the poet" .)