Unsuspected difficulty? Mine comes before autumn (7)
I believe the answer is:
pitfall
'unsuspected difficulty?' is the definition.
'pitfall' can be an answer for 'difficulty?' (pitfall is a kind of difficulty). I'm unsure of the 'unsuspected' bit.
'mine comes before autumn' is the wordplay.
'mine' becomes 'pit' (down the pit).
'comes before' is a charade indicator (letters next to each other).
'autumn' becomes 'fall' (synonyms).
'pit'+'fall'='PITFALL'
Can you help me to learn more?
(Other definitions for pitfall that I've seen before include "Hazard" , "Unexpected difficulty or danger" , "Hidden danger or difficulty" , "Unexpected problem" , "Unsuspected danger or difficulty - for miner?" .)