Glove to fetch relative left inside (8)
I believe the answer is:
gauntlet
'glove' is the definition.
(gauntlet is a kind of glove)
'fetch relative left inside' is the wordplay.
'fetch' becomes 'get' ('get' can be a synonym of 'fetch').
'relative' becomes 'aunt' (aunt is a kind of relative**).
'left' becomes 'l' (common abbreviation).
'inside' is an insertion indicator.
'aunt'+'l'='auntl'
'get' going around 'auntl' is 'GAUNTLET'.
'to' is the link.
(Other definitions for gauntlet that I've seen before include "Long-sleeved glove" , "Throw it down to offer a challenge" , "Glove of armoured leather, thrown down as a challenge" , "Glove with long sleeve, thrown down challenge" , "Throw this glove down as a challenge" .)