Virtuous man showing seasonal kindness? (8)
I believe the answer is:
goodwill
'seasonal kindness?' is the definition.
(Christmas time is the season of goodwill)
'virtuous man' is the wordplay.
'virtuous' becomes 'good' (synonyms).
'man' becomes 'will' (short for William).
'good'+'will'='GOODWILL'
'showing' is the link.
(Other definitions for goodwill that I've seen before include "compassion" , "intangible asset" , "Benevolence" , "Benevolent feeling - business asset" , "Disposition to kindness" .)