Anger, it seems, may harden (6)

I believe the answer is:

temper

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'anger' is the first definition.
(I know that temper is a type of annoyance)

'harden' is the second definition.
(I know that harden can be written as temper)

'it seems may' acts as a link.
This may not be right. Some or all of it may belong to one of the definitions.

Can you help me to learn more?

(Other definitions for temper that I've seen before include "Modify" , "Moderate; ill humour" , "Tendency to anger" , "Toughen by gradually heating and cooling" , "bait" .)

I've seen this clue in the Evening Standard.

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