Pretended son played badly (7)

I believe the answer is:

shammed

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This could be a double definition.

'pretended son' is the first definition.
'shammed' can be an answer for 'pretended' ('sham' can be a synonym of 'pretend'). I am not certain of the 'son' bit.

'played badly' is the second definition.
'shammed' can be an answer for 'played' (shamming is a kind of playing). I'm not sure about the 'badly' bit.

Can you help me to learn more?

(Other definitions for shammed that I've seen before include "Faked" , "Pretended to be, was not genuine" .)

I've seen this clue in The Guardian.

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