Where a lad gets out of breath (7)
I believe the answer is:
swindon
'where a lad' is the definition.
The definition suggests a singular noun which matches the answer.
'gets out of breath' is the wordplay.
'gets' becomes 'son' (I can't explain this - if you can you should give a lot more credence to this answer).
'out of' means one lot of letters goes inside another (some letters on the outside of others).
'breath' becomes 'wind' (wind is a kind of breath).
'son' placed around 'wind' is 'SWINDON'.
Can you help me to learn more?
(Other definitions for swindon that I've seen before include "22 [WILTS] town" , "English town" , "Large Wiltshire railway town" .)