Care for teachers is head's part (7)

I believe the answer is:

cherish

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'care for' is the definition.
(synonyms)

'teachers is head's part' is the wordplay.
'teachers' becomes 'cher' (I can't justify this - if you can you should believe this answer much more).
'part' indicates taking the first letters.
The first letter of 'heads' is 'h'.
'cher'+'is'+'h'='CHERISH'

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(Other definitions for cherish that I've seen before include "Protect and treat with affection" , "Foster" , "Nurse" , "Hold dear, treasure" , "Protect and care for lovingly" .)

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