Festive period, then over booze? That'll do for sobriety (7)
I believe the answer is:
decorum
'sobriety' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'festive period then over booze?' is the wordplay.
I cannot quite see how this works, but
'period' could be 'dec' (Dec is an example) and 'dec' is found in the answer.
'over' could be 'o' (cricket abbreviation) and 'o' is present in the answer.
'booze?' could be 'rum' (rum is a kind of booze) and 'rum' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'that'll do for' is the link.
Can you help me to learn more?
(Other definitions for decorum that I've seen before include "modesty" , "Dignity of behaviour or proceedings" , "Propriety in manners and conduct" , "Dignity of behaviour or procedure" , "Seemly behaviour" .)