'Is partly seen tantrum (5)

I believe the answer is:

strop

'tantrum' is the definition.

I don't understand the remainder of the clue.

(Other definitions for strop that I've seen before include "rage" , "Bad temper - sharpen (a razor)" , "Sharpen on piece of leather" , "wobbly" , "Razor-sharpener" .)

I've seen this clue in The Independent.

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