Hammer Thor needs taken up (9)

I believe the answer is:

shortened

'taken up' is the definition.

'hammer thor needs' is the wordplay.
'hammer' indicates an anagram (I've seen 'hammered' mean this (I've seen this in other clues)).
'thor'+'needs'='thorneeds'
'thorneeds' is an anagram of 'SHORTENED'.

(Another definition for shortened that I've seen is " Truncated".)

I've seen this clue in The Guardian.

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