Hole made by a shell, or maybe tracer (6)

I believe the answer is:

crater

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'hole' is the definition.
(I've seen this before)

'maybe tracer' is the wordplay.
'maybe' is an anagram indicator.
'tracer' is an anagram of 'CRATER'.

'made by a shell or' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for crater that I've seen before include "Volcanic depresssion" , "Volcano opening" , "Caldera" , "Lunar surface dent" , "Bowl-shaped opening" .)

I've seen this clue in the Evening Standard.

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