Big job for cigar and soup-mix! (6,4)
I believe the answer is:
magnum opus
'big job' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'cigar and soup-mix' is the wordplay.
'cigar' becomes 'magnum' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'mix' is an anagram indicator.
'soup' is an anagram of 'opus'.
'magnum'+'opus'='MAGNUM OPUS'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for magnum opus that I've seen before include "Writer's greatest work" , "Great work" , "one's best" , "finest creation" , "Greatest work of an artist" .)