Section of an outfit possibly indicating turret of a Panzer? (4,3)

I believe the answer is:

tank top

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'turret of a panzer?' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tank top that I've seen before include "Woollen sleeveless jumper" , "Item of gear" , "Sleeveless garment" , "Apparel" , "Upper body garment" .)

I've seen this clue in The Independent.

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