Record to break when in range (4)
I believe the answer is:
alps
'range' is the definition.
(mountain range)
'record to break when' is the wordplay.
'record' becomes 'L-P' (abbreviation for long play record).
'to break' indicates putting letters inside (inserted letters break the word apart).
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'lp' placed into 'as' is 'ALPS'.
'in' is the link.
(Other definitions for alps that I've seen before include "Pals put on the mountains" , "Mountain system, highest peak Mont Blanc" , "high areas" , "European mountain range" , "Slap about in mountains" .)