Fellow’s dangerous like a cat (6)
I believe the answer is:
frisky
'like a cat' is the definition.
I can't judge whether this defines the answer.
'fellow's dangerous' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'dangerous' becomes 'risky' (similar in meaning).
'f'+'risky'='FRISKY'
Can you help me to learn more?
(Other definitions for frisky that I've seen before include "High-spirited" , "Frolicsome" , "Playful, full of energy" , "Animated" , "Lively like playful dog" .)