I envy teacher's wild leaning towards infidelity (5-4,4)

I believe the answer is:

seven-year itch

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'leaning towards infidelity' is the definition.
I can't tell whether this definition defines the answer.

'i envy teacher's wild' is the wordplay.
'wild' indicates an anagram.
'i'+'envy'+'teachers'='ienvyteachers'
'ienvyteachers' anagrammed gives 'SEVEN-YEAR ITCH'.

Can you help me to learn more?

(Other definitions for seven-year itch that I've seen before include "Tendency towards infidelity - scabies" , "Desire to be unfaithful after some years of marriage" , "Desire to be maritally unfaithful" , "Scabies - which is said to make married men unfaithful" .)

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