Cover tip of finger in fresh guacamole (10)
I believe the answer is:
camouflage
'cover' is the definition.
(I know that camouflage is a type of cover)
'tip of finger in fresh guacamole' is the wordplay.
'tip of' suggests taking the first letters.
'in' is an insertion indicator.
'fresh' indicates an anagram (a fresh re-ordering of the letters).
The first letter of 'finger' is 'f'.
'guacamole' anagrammed gives 'camoulage'.
'f' put within 'camoulage' is 'CAMOUFLAGE'.
(Other definitions for camouflage that I've seen before include "Means of disguise" , "Green and brown on a green and brown background, say?" , "Method of blending in fine" , "Disguise (from enemy)" , "blind" .)