Miss out over a frequency or range (6)
I believe the answer is:
massif
'range' is the definition.
(I've seen this before)
'miss out over a frequency' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'over' means one lot of letters goes inside another.
'frequency' becomes 'f' (abbreviation e.g. FM radio).
'miss' anagrammed gives 'mssi'.
'mssi' placed around 'a' is 'massi'.
'massi'+'f'='MASSIF'
'or' is the link.
(Other definitions for massif that I've seen before include "mountain peak" , "highlands" , "French mountain range" , "Mountain centre" , "Compact group of mountains" .)