Pack animal hit bearing load unevenly (5)
I believe the answer is:
llama
'pack animal' is the definition.
(llamas are often used as pack animals)
'hit bearing load unevenly' is the wordplay.
I cannot really understand how this works, but
'hit' could be 'lam' (to 'lam' means to hit hard) and 'lam' is found in the answer.
The remaining letters 'la' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for llama that I've seen before include "Woollen cloth" , "Long-necked woolly animal" , "Andean beast of burden" , "S.American animal" , "Alpaca" .)