Insisted on having minutes, also, in legal document (8)
I believe the answer is:
demanded
'insisted on' is the definition.
(I've seen this before)
'minutes also in legal document' is the wordplay.
'minutes' becomes 'm'.
'also' becomes 'and' (I've seen this before).
'in' indicates putting letters inside.
'legal document' becomes 'deed' (deed is a kind of legal document).
'm'+'and'='mand'
'mand' put within 'deed' is 'DEMANDED'.
'having' is the link.
(Other definitions for demanded that I've seen before include "Requested peremptorily - won't take no for an answer" , "Dictated" , "Requested imperiously as if by right" , "Requested forcefully" , "Called for" .)