Crossword Genius

I tape cork up in cavity full of gas (3,6)

Ross

I believe the answer is:

air pocket

'cavity full of gas' is the definition.
(pocket of gas)

'i tape cork up' is the wordplay.
'up' indicates an anagram (letters get chucked up).
'i'+'tape'+'cork'='itapecork'
'itapecork' is an anagram of 'AIR-POCKET'.

'in' is the link.

(Other definitions for air pocket that I've seen before include "local region of low pressure" , "Vacuum caused by an atmospheric down-draught" , "Local area of low pressure that causes a plane to lose height suddenly" .)

I've seen this clue in The Independent.
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