Detest keeping in one European city for winter (9)
I believe the answer is:
hibernate
'winter' is the definition.
(I've seen this before)
'detest keeping in one european city' is the wordplay.
'detest' becomes 'hate' (synonyms).
'keeping' is an insertion indicator (some letters kept inside).
'in one' becomes 'i' (Roman numeral. I am not sure about the 'in' bit.).
'european city' becomes 'bern' (capital of Switzerland).
'i'+'bern'='ibern'
'hate' going around 'ibern' is 'HIBERNATE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for hibernate that I've seen before include "Breathe in to settle down for winter sleep" , "Of animals, sleep through the winter" , "go dormant" , "go out in the snow?" , "Become dormant" .)