Plans seem strange, following small church (7)
I believe the answer is:
Here is my best explanation:
'plans' is the definition.
(scheme is a kind of plan)
'seem strange following small church' is the subsidiary indication.
'strange' indicates anagramming the letters.
'following' says to put letters next to each other.
'small' becomes 's' (abbreviation - e.g. clothes size).
'church' becomes 'ch' (common abbreviation).
'seem' is an anagram of 'emes'.
'emes' put after 'sch' is 'schemes'.
(Other definitions for schemes that I've seen before include "Plans, plots, projects", "Plots and plans" and "''The best-laid ... o' mice an' men Gang aft a-gley''".)