Asked for decimal approximation (7)

I believe the answer is:

claimed

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'asked' is the definition.
(claiming is a kind of asking)

'decimal approximation' is the wordplay.
'decimal' can be anagrammed to 'CLAIMED'.
Though, I am not sure how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for claimed that I've seen before include "Called for" , "Asserted, contended" , "Declared" , "Alleged" , "Asserted right to or interest in" .)

I've seen this clue in The Hindu.

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