A model attitude, if only a pretence (4)

I believe the answer is:

pose

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'pretence' is the definition.
(I know that pose is a type of pretence)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pose that I've seen before include "Sit for picture" , "Stance - attitude" , "Assume an attitude (for photo etc)" , "Models do it for photographic or artistic purposes" , "Strike an attitude as for photo" .)

I've seen this clue in the Evening Standard.

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