Foolishness of Roman god trapped in very cold surroundings (6)
I believe the answer is:
idiocy
'foolishness' is the definition.
(I've seen this before)
'of roman god trapped in very cold surroundings' is the wordplay.
'of roman' becomes 'io' (I am not sure about this - if you are sure you should believe this answer much more).
'god' becomes 'D' (abbreviation in various Latin phrases).
'trapped in' is an insertion indicator.
'very cold' becomes 'icy' (I've seen this in another clue).
'surroundings' means one lot of letters goes inside another.
'd' inserted into 'icy' is 'idcy'.
'io' put into 'idcy' is 'IDIOCY'.
Can you help me to learn more?
(Other definitions for idiocy that I've seen before include "Extreme foolishness" , "Extreme silliness" , "Great folly" , "Imbecility" , "Foolish action or behaviour" .)