Possibly biting cold for half an hour (3)
I believe the answer is:
cur
'possibly biting' is the definition.
I can't judge whether this definition defines the answer.
'cold for half an hour' is the wordplay.
'cold' becomes 'c' (abbreviation, eg on taps).
'for' says to put letters next to each other.
'half an' means to take half the letters.
'hour' halved is 'ur'.
'c'+'ur'='CUR'
Can you help me to learn more?
(Other definitions for cur that I've seen before include "A low worthless dog" , "Scoundrel; mongrel dog" , "Aggressive dog" , "Aggressive mongrel" , "Worthless mongrel" .)