Lighthearted relative rented a glove (8)

I believe the answer is:

gauntlet

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'a glove' is the definition.
(gauntlet is a kind of glove)

'lighthearted relative rented' is the wordplay.
'lighthearted relative' becomes 'gaunt' (I am not sure about this - if you are sure you should believe this answer much more).
'rented' becomes 'let' (I've seen this before).
'gaunt'+'let'='GAUNTLET'

Can you help me to learn more?

(Other definitions for gauntlet that I've seen before include "Glove with long sleeve, thrown down challenge" , "Iron glove" , "Knight's glove" , "Long-sleeved glove" , "handy protection" .)

I've seen this clue in the Sydney Morning Herald.

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