Able to grasp floating sphere with line (10)
I believe the answer is:
prehensile
'able to grasp' is the definition.
(as in a prehensile tail)
'floating sphere with line' is the wordplay.
'floating' indicates anagramming the letters (float can mean fluctuate or oscillate).
'with' means one lot of letters go next to another.
'sphere'+'line'='sphereline'
'sphereline' is an anagram of 'PREHENSILE'.
(Other definitions for prehensile that I've seen before include "making a clutch possible" , "Able to grasp an object -- Helen is rep (anag)" , "Able to grasp - her in sleep (anag)" , "Adapted for gripping" , "Capable of grasping" .)