Crossword Genius

Changes hat in place where just one at a time is allowed (9)

Ross

I believe the answer is:

turnstile

'place where just one at a time is allowed' is the definition.
(only one person can use a turnstile at once)

'changes hat' is the wordplay.
'changes' becomes 'turns' (turn is a kind of change).
'hat' becomes 'tile' (I've seen this before).
'turns'+'tile'='TURNSTILE'

'in' is the link.

(Other definitions for turnstile that I've seen before include "where spectators pass" , "Gate admitting one at a time" , "Rotating gate" , "Admission gate" , "Control for spectators' entry" .)

I've seen this clue in The Telegraph.
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