Crossword Genius

Crater roughly enclosing tree (7)

Ross

I believe the answer is:

caldera

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

'roughly enclosing tree' is the wordplay.
'roughly' becomes 'ca'.
'enclosing' is an insertion indicator.
'tree' becomes 'alder' (alder tree is a kind of tree**).
'ca' enclosing 'alder' is 'CALDERA'.

(Other definitions for caldera that I've seen before include "Result of eruption" , "Large volcanic crater - race lad (anag)" , "Basin-shaped crater at top of volcano" , "Large volcanic crater -- lead car (anag)" , "Big hole in rock" .)

I've seen this clue in The Times.
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