Happen to arrive at a gap between the peaks (4,2,4)
I believe the answer is:
come to pass
'happen' is the definition.
(synonyms)
'to arrive at a gap between the peaks' is the wordplay.
I cannot quite understand how this works, but
'to' is present in the answer.
'arrive' could be 'come' (synonyms) and 'come' is found within the answer.
'a' is present in the answer.
The remaining letters 'pss' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for come to pass that I've seen before include "Short military stick" , "reach mountain road" , "Biblically happen" , "Take place" .)