Love being in cool pants? I'm turning urbane (12)
I believe the answer is:
cosmopolitan
'urbane' is the definition.
('cosmopolitan' can be similar in meaning to 'urbane')
'love being in cool pants? i'm turning' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'being in' is an insertion indicator.
'turning' indicates anagramming the letters.
'cool'+'pants'+'im'='coolpantsim'
'coolpantsim' is an anagram of 'csmopolitan'.
'o' placed inside 'csmopolitan' is 'COSMOPOLITAN'.
(Other definitions for cosmopolitan that I've seen before include "At ease in many different cultures" , "Worldly, sophisticated" , "all around the world" , "Familiar with many cultures" , "international" .)