Small man going to the city at an opportune moment (6)
I believe the answer is:
timely
'at an opportune moment' is the definition.
I can't judge whether this definition defines the answer.
'small man going to the city' is the wordplay.
'small man' becomes 'Tim' (short for Timothy; 'small' asks for an abbreviation).
'going to' means one lot of letters go next to another.
'the city' becomes 'ely' (I've seen this before).
'tim'+'ely'='TIMELY'
Can you help me to learn more?
(Other definitions for timely that I've seen before include "At an opportune occasion" , "Occurring at just the right moment or occasion" , "Seasonable" , "Opportune and convenient" , "At an appropriate hour" .)