Fit any glove using elastic basically (4)
I believe the answer is:
ague
'fit' is the definition.
(I've seen this before)
'any glove using elastic basically' is the wordplay.
'basically' says to take the initial letters (the first letter could be its root or base).
The first letters of 'any glove using elastic' is 'AGUE'.
(Other definitions for ague that I've seen before include "Fever (archaic)" , "nasty illness?" , "Illness with fever and shivering, malaria say" , "Sickness" , "Burning fever" .)