Crossword Genius

It stops the flow of dry hair (7)


I believe the answer is:


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'it stops the flow' is the definition.
The definition suggests a singular noun which matches the answer.

'dry hair' is the wordplay.
'dry' becomes 'air' (airing is a kind of drying).
'hair' becomes 'lock' (a lock of hair).

'of' acts as a link.

Can you help me to learn more?

(Other definitions for airlock that I've seen before include "Bubble obstructing flow" , "plumbing problem" , "chamber?" , "obstruction" .)

I've seen this clue in The Guardian.
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