Crossword Genius

Time locks guarding home into which one could disappear? (4,3)

Ross

I believe the answer is:

thin air

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'which one could disappear?' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'time locks guarding home' is the wordplay.
'time' becomes 't' (abbreviation).
'locks' becomes 'hair' (locks can mean hair).
'guarding' is an insertion indicator (inserted letters are protected or guarded).
'home' becomes 'in' ('he's home' can mean 'he's in').
'hair' enclosing 'in' is 'hinair'.
't'+'hinair'='THIN AIR'

'into' acts as a link.

Can you help me to learn more?

(Other definitions for thin air that I've seen before include "To vanish into this is to become invisible" , "Vanish completely as into . . . . . . ., on high mountain?" , "Out of -- means from nowhere" , "In which things vanish, magically" , "one may disappear into?" .)

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