British countryside is rather insipid (5)
I believe the answer is:
bland
'rather insipid' is the definition.
'bland' can be an answer for 'insipid' (synonyms). I'm not sure about the 'rather' bit.
'british countryside' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'countryside' becomes 'land' (I've seen this in other clues).
'b'+'land'='BLAND'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for bland that I've seen before include "Insipid, banal" , "Insipid; lacklustre" , "Lacking taste, flavour" , "Insipid, vapid" , "without distinctive characteristics" .)