Emergency food big-billed bird left out for two months? (8)
I believe the answer is:
pemmican
'emergency food' is the definition.
'pemmican' can be an answer for 'food' (pemmican is a kind of food). I am unsure of the 'emergency' bit.
'big-billed bird left out for two months?' is the wordplay.
I cannot quite understand how this works, but
'months?' could be 'mm' (an abbreviation for month written twice) and 'mm' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for pemmican that I've seen before include "Dried rations" , "Dried beef" , "survival rations" , "Arctic rations" , "Dried meat" .)