I'll face scramble on steep part of glacier (7)
I believe the answer is:
icefall
'steep part of glacier' is the definition.
(I've seen this before)
'i'll face scramble' is the wordplay.
'scramble' is an anagram indicator.
'ill'+'face'='illface'
'illface' is an anagram of 'ICEFALL'.
'on' is the link.
(Other definitions for icefall that I've seen before include "Steep part of a glacier where the surface is badly broken" , "Avalanche; steep part of glacier" .)