Long week finally occupied randomly learning (9)
I believe the answer is:
knowledge
'learning' is the definition.
(I've seen this before)
'long week finally occupied randomly' is the wordplay.
'finally' says to take the final letters.
'randomly' is an anagram indicator (I've seen 'roaming randomly' mean this).
The last letter of 'occupied' is 'd'.
'long'+'week'+'d'='longweekd'
'longweekd' is an anagram of 'KNOWLEDGE'.
(Other definitions for knowledge that I've seen before include "Information; awareness" , "a small amount is risky" , "Information - erudition" , "Info" , "Result of learning - awareness" .)