Scotsman fighting bear: it's gruesome (7)
I believe the answer is:
macabre
'gruesome' is the definition.
(synonyms)
'scotsman fighting bear' is the wordplay.
I cannot quite understand how this works, but
'scotsman' could be 'mac' and 'mac' is found within the answer.
an anagram of 'bear' is 'abre' which is present in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for macabre that I've seen before include "Gruesome, suggesting death" , "Ghostly appearance" , "'Grisly, gruesome (7)'" , "Gruesome and weird" , "Shockingly horrible" .)