Organised sources of grand escapade in the Himalayas? (5)
I believe the answer is:
range
'himalayas?' is the definition.
(himalayas is a kind of range)
'organised sources of grand escapade' is the wordplay.
'organised' becomes 'ran' (I've seen this before).
'sources of' indicates taking the first letters.
The first letters of 'grand escapade' is 'ge'.
'ran'+'ge'='RANGE'
'in the' acts as a link.
(Other definitions for range that I've seen before include "Old-style cooking stove" , "Series of connected mountains" , "Cut; cultivated plant" , "Variation within limits" , "cover a certain area" .)