Tax form sent out for guidance (7)

I believe the answer is:

sextant

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'guidance' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'tax form sent out' is the wordplay.
'form' is an anagram indicator (a different form of the same letters).
'out' is an insertion indicator.
'tax' anagrammed gives 'xta'.
'xta' inserted within 'sent' is 'SEXTANT'.

'for' is the link.

Can you help me to learn more?

(Other definitions for sextant that I've seen before include "Measuring instrument on board" , "Navigational instrument for finding position" , "Astronavigation instrument" , "Nautical instrument for measuring angular distances" , "Navigator's instrument" .)

I've seen this clue in the Evening Standard.

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