Sketch a train track leaving the city? (7)
I believe the answer is:
outline
'sketch' is the definition.
(synonyms)
'a train track leaving the city?' is the wordplay.
I cannot really understand how this works, but
'track' could be 'line' (line is a kind of track) and 'line' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
The remaining letters 'ou' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for outline that I've seen before include "route" , "Framework" , "Draft plan - indicator of shape" , "Preliminary draft" , "Plan with little detail" .)