Pools entries made by writing (5)

I believe the answer is:

perms

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'pools entries' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

'by writing' is the wordplay.
'by' becomes 'per' (I've seen this in another clue).
'writing' becomes 'ms' (abbreviation for manuscript).
'per'+'ms'='PERMS'

'made' acts as a link.

Can you help me to learn more?

(Another definition for perms that I've seen is " Hairdos".)

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