Grip had faltered with rising din (8)
I believe the answer is:
adhesion
'grip' is the definition.
(grip is something's adhesion to a surface)
'had faltered with rising din' is the wordplay.
'faltered' indicates an anagram (I've seen 'faltering' mean this).
'with' means one lot of letters go next to another.
'rising' is a reversal indicator (going up in a down clue).
'din' becomes 'noise' (I've seen this before).
'noise' backwards is 'esion'.
'had' with letters rearranged gives 'adh'.
'adh'+'esion'='ADHESION'
(Other definitions for adhesion that I've seen before include "The property of sticking" , "Sticking fast" , "Grip" , "strong attachment" , "Stickiness" .)