Temporary digs for Jonah Hill are oddly messy after a week (5)
I believe the answer is:
whale
'temporary digs for jonah' is the definition.
I can't tell whether this defines the answer.
'hill are oddly messy after a week' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
'messy' is an anagram indicator.
'after' means one lot of letters go next to another.
'a week' becomes 'w' (abbreviation).
'hill'+'are'='hillare'
The alternating letters of 'hillare' are 'hlae'.
'hlae' anagrammed gives 'hale'.
'hale' after 'w' is 'WHALE'.
Can you help me to learn more?
(Other definitions for whale that I've seen before include "Large animal" , "Maybe humpback" , "Patch of oil, on water" , "Biblical swallower of Jonah" , "It breathes through a blowhole" .)