Regard as a verbal agreement (3)
I believe the answer is:
eye
I believe this is a double definition.
'regard' is the first definition.
(I've seen this before)
'a verbal agreement' is the second definition.
(sounds like 'aye')
'as' acts as a 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)" .)