High-calorie dip is perhaps seasonal (10)
I believe the answer is:
periodical
'is perhaps seasonal' is the definition.
(happening at regular periods)
'high-calorie dip' is the wordplay.
'high' indicates an anagram (can mean drunk or on drugs and hence disordered).
'calorie'+'dip'='caloriedip'
'caloriedip' anagrammed gives 'PERIODICAL'.
(Other definitions for periodical that I've seen before include "Magazine" , "Newspaper" , "Publication" .)