I'm surprised - two holiday houses! (3)

I believe the answer is:

oho

'i'm surprised' is the definition.
(exclamation of surprise)

'two holiday houses' is the wordplay.
'houses' says the answer is hidden in the clue (part of the clue houses the answer).
'OHO' can be found hidden inside 'two holiday'.

(Other definitions for oho that I've seen before include "Expression of surprise" , "I see!" , "Triumphant cry" .)

I've seen this clue in The Independent.

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