Somewhere fresh, like Milton Keynes (3,4)
I believe the answer is:
new town
'somewhere fresh like milton keynes' is the definition.
The definition suggests a singular noun which matches the answer.
'fresh like milton keynes' is the wordplay.
'fresh' becomes 'new' (synonyms).
'like milton keynes' becomes 'town' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'new'+'town'='NEW TOWN'
Can you help me to learn more?
(Other definitions for new town that I've seen before include "Large conurbation planned and built as a complete unit" , "urban development" , "garden city?" , "Milton Keynes, Telford or East Kilbride, for example" , "Basildon, perhaps ..." .)