Relative beginning to laugh? Get boxing glove (8)
I believe the answer is:
gauntlet
'glove' is the definition.
(I know that gauntlet is a type of glove)
'relative beginning to laugh? get boxing' is the wordplay.
'relative' becomes 'aunt' (aunt is a type of relative).
'beginning to' suggests taking the first letters.
'boxing' means one lot of letters goes inside another ('box' can mean contain, as in to put in a box).
The first letter of 'laugh' is 'l'.
'aunt'+'l'='auntl'
'auntl' going inside 'get' is 'GAUNTLET'.
(Other definitions for gauntlet that I've seen before include "handy protection" , "outdated military punishment" , "Punishment to be run - heavy glove" , "Glove with long sleeve, thrown down challenge" , "Strong glove, thrown down in challenge" .)