Ham might be this cold after a bit, almost (6)
I believe the answer is:
acting
'ham' is the definition.
(thesaurus)
'this cold after a bit almost' is the wordplay.
'this cold' becomes 'c' (eg on taps).
'after' means one lot of letters go next to another.
'bit almost' becomes 'ting' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'c' after 'a' is 'ac'.
'ac'+'ting'='ACTING'
'might be' acts as a link.
Can you help me to learn more?
(Other definitions for acting that I've seen before include "stagecraft" , "Deputy" , "On stage; standing in for" , "Temporarily doing another's duties" , "Behaving like a player" .)