Our Duncan swallowed tongue (4)

I believe the answer is:

urdu

'tongue' is the definition.
(Urdu is an example)

'our duncan swallowed' is the wordplay.
'swallowed' says the answer is hidden in the clue (I've seen 'swallowing' mean this).
'URDU' is hidden within 'our duncan'.

(Other definitions for urdu that I've seen before include "Language used in Pakistan, India" , "Channel to north of Isle of Wight" , "Language akin to Hindi" , "Asian language written in Arabic script" , "Pakistani tongue" .)

I've seen this clue in The Mirror.

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