Channel's special feature (6)

I believe the answer is:

strait

'channel's' is the definition.
(strait is a kind of channel)

'special feature' is the wordplay.
'special' becomes 'S' (common abbreviation as in Special Air Service).
'feature' becomes 'trait' (I've seen this in another clue).
's'+'trait'='STRAIT'

(Other definitions for strait that I've seen before include "Narrow sea passage" , "Narrow or difficult" , "Catch in a trap" , "Narrow waterway" , "Narrow strip of water between two larger ones" .)

I've seen this clue in The Guardian.

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