Start of summer and we will get retreat in country (6)
I believe the answer is:
sweden
'country' is the definition.
(I know that Sweden is a country)
'start of summer and we will get retreat' is the wordplay.
'start of' suggests taking the first letters.
'and' is a charade indicator (letters next to each other).
'will get' says to put letters next to each other.
'retreat' becomes 'den' (both can mean a lair or hideout).
The initial letter of 'summer' is 's'.
's'+'we'+'den'='SWEDEN'
'in' acts as a link.
(Other definitions for sweden that I've seen before include "Nobel's country" , "Its capital's Stockholm" , "Country with blue and yellow flag" , "Stockholm is the capital" , "North European country" .)