Crossword Genius

Structure dropping off eggs, old guest scoffing most of pot (10)

Ross

I believe the answer is:

ovipositor

'structure dropping off eggs' is the definition.

'old guest scoffing most of pot' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'guest' becomes 'visitor' (I've seen this before).
'scoffing' means one lot of letters goes inside another.
'most of' means to remove the last letter.
'pot' with its last letter removed is 'po'.
'visitor' going around 'po' is 'vipositor'.
'o'+'vipositor'='OVIPOSITOR'

I've seen this clue in The Guardian.
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