Imagine cooler country on the borders (5)
I believe the answer is:
fancy
'imagine' is the definition.
(I know that fancy is a type of imagine)
'cooler country on the borders' is the wordplay.
'cooler' becomes 'fan' (I've seen this in another clue).
'on the borders' means to remove the middle letters (the edge/border letters).
'country' with its centre removed is 'cy'.
'fan'+'cy'='FANCY'
(Other definitions for fancy that I've seen before include "idea" , "Imagine - whim - highly decorated" , "Have a crush on" , "Imagine; desire" , "Imagine; complicated" .)