Puzzling new game I cracked – triumphant at last I see! (9)
I believe the answer is:
enigmatic
'puzzling' is the definition.
(synonyms)
'new game i cracked triumphant at last i see' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'cracked' indicates anagramming the letters.
'at last' indicates one should take the final letters.
'i see' becomes 'ic' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The final letter of 'triumphant' is 't'.
'n'+'game'+'i'='ngamei'
'ngamei' is an anagram of 'enigma'.
'enigma'+'t'+'ic'='ENIGMATIC'
Can you help me to learn more?
(Other definitions for enigmatic that I've seen before include "Mysterious or puzzling, like Mona Lisa's smile" , "Puzzling, like the Sphinx" , "not obvious" , "Hard to fathom" , "Cryptic, mysterious" .)