Spruce, last in Christmas market (5)
I believe the answer is:
smart
'spruce' is the definition.
(synonyms)
'last in christmas market' is the wordplay.
'last in' indicates one should take the final letters.
'market' becomes 'mart' (synonyms).
The last letter of 'christmas' is 's'.
's'+'mart'='SMART'
(Other definitions for smart that I've seen before include "Well turned out" , "Intelligent; sting" , "Rankle; trim" , "Quick - trim" , "Clean and stylish" .)