Lump of skin: hurry to conceal odd bits (4)
I believe the answer is:
knur
'lump' is the definition.
(thesaurus)
'skin hurry to conceal odd bits' is the wordplay.
'to conceal odd bits' indicates alternate letters (letters in odd-numbered positions removed).
'skin'+'hurry'='skinhurry'
The alternating letters of 'skinhurry' are 'KNUR'.
'of' acts as a link.
(Other definitions for knur that I've seen before include "Part of tree" , "growth" , "Knot in wood" .)