The practicality to have a park in a built-up area? (6,5)
I believe the answer is:
common sense
'the practicality' is the definition.
(thesaurus)
'a park in a built-up area?' is the wordplay.
I cannot quite see how this works, but
'park' could be 'commons' (synonyms) and 'commons' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'to have' is the link.
Can you help me to learn more?
(Other definitions for common sense that I've seen before include "realistic" , "Sound practical judgement" , "Good judgment" , "Prudence" , "Gumption" .)