Deviously tiptoe in to make request (8)
I believe the answer is:
petition
'request' is the definition.
(petition is a kind of request)
'deviously tiptoe in' is the wordplay.
'deviously' indicates anagramming the letters (I've seen this in other clues).
'tiptoe'+'in'='tiptoein'
'tiptoein' anagrammed gives 'PETITION'.
'to make' is the link.
(Other definitions for petition that I've seen before include "Suit - supplication" , "Formal request with many signatures" , "Written request" , "Prayer" , "Formal request submitted to authority" .)