On the table, is this number a mere bagatelle? (3)

I believe the answer is:

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This could be a double definition.

'on the table is this number a mere' is the first definition.
'pin' can be an answer for 'number' (I've seen this before). I am unsure of the rest of the definition.

'bagatelle?' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for pin that I've seen before include "Badge" , "form of identification" , "Needle" , "Stick with flag placed in golf hole" , "Skittle; chess attack" .)

I've seen this clue in the Evening Standard.

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