A dame packing heat put blade away (7)
I believe the answer is:
sheathe
'blade away' is the definition.
I can't tell whether this definition defines the answer.
'a dame packing heat' is the wordplay.
'a dame' becomes 'she' (I can't explain this - if you can you should give a lot more credence to this answer).
'packing' is an insertion indicator (some letters are packed inside).
'she' enclosing 'heat' is 'SHEATHE'.
'put' acts as a link.
Can you help me to learn more?
(Other definitions for sheathe that I've seen before include "stow away safely" , "Put (a sword) into its holder" , "Put (a sword) it its cover" , "Encase in protection" , "Protective cover, for sword say" .)