Souvenir of pure lichen (5)

I believe the answer is:

relic

'souvenir' is the definition.
(I know that souvenir can be written as relic)

'of pure lichen' is the wordplay.
'of' indicates the answer is hidden within the clue.
'RELIC' can be found hidden inside 'pure lichen'.

(Other definitions for relic that I've seen before include "Left over item, sometimes sacred" , "Surviving artefact" , "Memorial of antiquity" , "Hangover from an earlier time" , "Ossified survival" .)

I've seen this clue in The Mirror.

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