Tactile floating web (7)
I believe the answer is:
lattice
'web' is the definition.
(I've seen this before)
'tactile floating' is the wordplay.
'floating' is an anagram indicator (float can mean fluctuate or oscillate).
'tactile' with letters rearranged gives 'LATTICE'.
(Other definitions for lattice that I've seen before include "Regular open structure" , "type of tracery" , "Sort of window" , "Web" , "Support for plants" .)