Describes a spirit at Halloween in Lough Mask taking head off trout (8)
I believe the answer is:
ghoulish
'describes a spirit at halloween' is the definition.
I can't tell whether this definition defines the answer.
'lough mask taking head off trout' is the wordplay.
I cannot quite see how this works, but
an anagram of 'lough' is 'ghoul' which is present in the answer.
The remaining letters 'ish' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for ghoulish that I've seen before include "Macabre" , "Morbid, horrible" , "Morbidly interested in death or disaster" , "Gruesome" .)