Writhe around and become weaker (6)

I believe the answer is:

wither

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'become weaker' is the definition.
I can't tell whether this defines the answer.

'writhe around' is the wordplay.
'around' indicates anagramming the letters.
'writhe' with letters rearranged gives 'WITHER'.

'and' is the link.

Can you help me to learn more?

(Other definitions for wither that I've seen before include "Turn dry and shrivelled" , "Become dry and shrivel" , "Writhe (anag.)" , "Become shrivelled, lose freshness" , "Dry up and perish" .)

I've seen this clue in the Evening Standard.

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