Bitter card sent around one (5)
I believe the answer is:
acrid
'bitter' is the definition.
(I know that bitter can be written as acrid)
'card sent around one' is the wordplay.
'sent' indicates an anagram (send can mean to excite or stimulate).
'around' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'card' anagrammed gives 'acrd'.
'acrd' going around 'i' is 'ACRID'.
(Other definitions for acrid that I've seen before include "Unpleasantly pungent" , "Strong and sharp-smelling" , "Sour, pungent" , "Strong and sharp" , "Bitter in smell, like smoke" .)