Out-of-head Scandinavians and boozers ... (4)
I believe the answer is:
inns
'boozers' is the definition.
'out-of-head scandinavians and' is the wordplay.
'out' becomes 'in' (I can't justify this - if you can you should believe this answer much more).
'of' indicates anagramming the letters (the answer comes from or \'of\' the letters).
'head' suggests taking the first letters.
'and' becomes 'n' (common abbreviation for 'and').
The first letter of 'scandinavians' is 's'.
's'+'n'='sn'
'sn' with letters rearranged gives 'ns'.
'in'+'ns'='INNS'
Can you help me to learn more?
(Other definitions for inns that I've seen before include "Old-time hostelries" , "Locals" , "Places of rest and sustenance for travellers" , "Drink here and learn about the King's law" , "Bars" .)