It's used for making a red hat (6)

I believe the answer is:

thread

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'it's used' is the definition.
I can't tell whether this definition defines the answer.

'making a red hat' is the wordplay.
'making' is an anagram indicator.
'red'+'hat'='redhat'
'redhat' anagrammed gives 'THREAD'.

'for' is the link.

Can you help me to learn more?

(Other definitions for thread that I've seen before include "Dearth (anag)" , "Fine strand" , "Dearth of stitching material" , "What sewer takes" , "Subject" .)

I've seen this clue in The Irish Independent.

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