Crossword Genius

Complex order of lettuce, mostly halved (6)

Ross

I believe the answer is:

cosmos

I'm a little stuck... Click here to teach me more about this clue!

'complex order' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'lettuce mostly halved' is the wordplay.
'lettuce' becomes 'cos' (cos lettuce is a kind of lettuce).
'halved' suggests halving the letters.
'mostly' cut in half is 'mos'.
'cos'+'mos'='COSMOS'

'of' is the link.

Can you help me to learn more?

(Other definitions for cosmos that I've seen before include "The entire universe." , "Universe as an ordered whole" , "Universe seen as a whole" , "The universe, whole of creation" , "Universe as an ordered system" .)

I've seen this clue in the Sydney Morning Herald.
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