Here in Quebec, undressed, we're colder (5)
I believe the answer is:
icier
'colder' is the definition.
('icy' can be similar in meaning to 'cold')
'here in quebec undressed we're' is the wordplay.
'here in quebec' becomes 'ici' (I've seen this in another clue).
'undressed' indicates the central letters (the word removes the letters which clothe it).
The central letters of 'were' are 'er'.
'ici'+'er'='ICIER'
(Other definitions for icier that I've seen before include "with increased chance of freezing" , "Colder even than 31 Across" , "More glacial" , "rather cold" , "More cold or frozen" .)