Lean beyond wobbly fringe, extremity (9)
I believe the answer is:
fingertip
'extremity' is the definition.
(fingertip is a kind of extremity)
'lean beyond wobbly fringe' is the wordplay.
'lean' becomes 'tip' (synonyms).
'beyond' says to put letters next to each other.
'wobbly' is an anagram indicator (I've seen this in other clues).
'fringe' anagrammed gives 'finger'.
'tip' after 'finger' is 'FINGERTIP'.
(Other definitions for fingertip that I've seen before include "Pointer" , "One's used to feel" , "One of the points" , "at which things are very familiar" , "Digital extremity" .)