Orderly and clear-headed, with less stout (7)
I believe the answer is:
cleaner
'orderly' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'clear-headed with less stout' is the wordplay.
'clear' becomes 'clean' (synonyms).
'headed with less stout' becomes 'er' (I can't justify this - if you can you should give a lot more credence to this answer).
'clean'+'er'='CLEANER'
'and' is the link.
Can you help me to learn more?
(Other definitions for cleaner that I've seen before include "Maybe Daily" , "Less soiled" , "Char; less dirty" , "Chemical agent for removing dirt" , "More hygienic" .)