Regard as a verbal agreement (3)
I believe the answer is:
eye
This clue is a double definition.
'regard' is the first definition.
(I've seen this in another clue)
'a verbal agreement' is the second definition.
(sounds like 'aye')
'as' is the link.
(Other definitions for eye that I've seen before include "1 across, 4 across, for example" , "Needle or lace hole" , "Symmetrical spot" , "Globular organ" , "'Cast a cold ... on life, on death' (Yeats)" .)