Sort of lamp to rest on pendant (9)

'pendant' is the definition.
(I know that lavaliere is a type of pendant)

'sort of lamp to rest on' is the wordplay.
I cannot quite understand how this works, but
'rest' could be 'lie' (synonyms) and 'lie' is found within the answer.
'on' could be 're' (regarding) and 're' is found in the answer.
The remaining letters 'lava' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?