Strangely there's no sense in unity (7)
I believe the answer is:
oneness
'unity' is the definition.
('oneness' can be a synonym of 'unity')
'strangely there's no sense' is the wordplay.
'strangely' is an anagram indicator.
'there's' says to put letters next to each other.
'no' put next to 'sense' is 'nosense'.
'nosense' is an anagram of 'ONENESS'.
'in' is the link.
(Other definitions for oneness that I've seen before include "Unified state" , "single state" , "Agreement" , "Identity" , "singularity" .)