The way to town, for us, is difficult (7)
I believe the answer is:
serious
'difficult' is the definition.
(similar in meaning)
'the way to town for us' is the wordplay.
I cannot really understand how this works, but
'way' could be 's' (Compass direction - South) and 's' is found within the answer.
'us' is present in the answer.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for serious that I've seen before include "Solemn, thoughtful" , "Earnest; vital" , "Important -- grave" , "Earnest, sincere" , "Earnest - important" .)