Adore snug pants? That's fraught with peril! (9)
I believe the answer is:
dangerous
'fraught with peril' is the definition.
I can't tell whether this definition defines the answer.
'adore snug pants?' is the wordplay.
'pants?' indicates anagramming the letters (UK informal term for 'nonsense' or 'rubbish').
'adore'+'snug'='adoresnug'
'adoresnug' anagrammed gives 'DANGEROUS'.
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for dangerous that I've seen before include "posing a threat" , "menacing" , "Pope: 'A little learning is a . . . . . . . . . thing'" , "Hazardous" , "Not safe" .)