Something you pull with difficulty from the tool bag? (6)

I believe the answer is:

wrench

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'tool bag?' is the definition.
'wrench' can be an answer for 'tool' (I've seen this before). I'm not certain of the 'bag?' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for wrench that I've seen before include "Violent twist; tool" , "Spanner-like tool" , "Twisting tool" , "Tear away" , "Yank" .)

I've seen this clue in the Evening Standard.

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